{ "meta": { "api_type": "NWO Projects API", "version": "1.0.2", "licence": { "name": "CC0 1.0 Universal", "url": "https://creativecommons.org/publicdomain/zero/1.0", "description": "To the extent possible under law, all copyright and related or neighbouring rights have been waived worldwide to the data made available through this API." }, "documentation": "https://doi.org/10.5281/zenodo.14918287", "release_date": "2025-08-20T00:00:00", "funder": "https://doi.org/10.13039/501100003246", "ror_id": "https://ror.org/04jsz6e67", "date": "2026-11-05T00:00:00", "count": 2, "per_page": 100, "pages": 1, "page": 1 }, "projects": [ { "project_id": "680-47-502", "title": "Harnessing quantum dynamics and structure of complex molecules and simple atoms", "funding_scheme_id": 667, "funding_scheme": "NWO-Talentprogramma Vici 2007 N", "department": "Exacte en Natuurwetenschappen", "sub_department": "Natuurkunde", "start_date": "2008-05-01T00:00:00", "end_date": "2015-04-23T00:00:00", "reporting_year": 2007, "summary_nl": "The invention of the frequency-comb laser (Nobel Prize of Physics 2005 to Hänsch and Hall) has revolutionized the way the structure and dynamics of matter over a wide range of complexity can be investigated. These lasers produce ultrafast pulses (typically in the near-infrared), with a full control over phase and amplitude of electromagnetic waves. The pulses are produced at high repetition rate, so that the corresponding optical spectrum consists of an equidistant comb of highly accurately known frequencies. This offers the potential to obtain a sub-femtosecond resolution in the time domain and a spectral resolution of better than 10^-15 in the frequency domain.\n\nThe revolution this has caused does not stop at physics, nor is it limited to infrared or optical frequencies. Two fields are identified, seemingly opposite in complexity, where the potential impact of frequency-comb lasers is prominent. The first is structure and dynamics analysis of complex (bio-)molecules in the gas phase. To gain full control over the external and internal molecular degrees of freedom, and to localize and address individual molecules, it is proposed to sympathetically cool and trap them in laser-cooled ion-crystals. Combined with pulse-shaping (evolutionary optimization) and coherent multi-pulse excitation, it allows unique possibilities to study attosecond timescale electron dynamics in e.g. tryptophan, of one of the most important amino acids involved in biological electron-transfer processes.\n\nThe second line of research involves the electronic structure of the most simple atoms: hydrogen-like ions (He+, Li++ ...), also stored and cooled in an ion-trap. Compared to current measurements in hydrogen, it is expected that new tests of quantum-electrodynamics and nuclear size models can be performed in the search for physics beyond the `standard model'. The proposed excitation method is based on quantum-interference excitation with multiple extreme-ultraviolet and shorter wavelength pulses, obtained by harmonic up-conversion of amplified frequency-comb lasers.\n", "summary_en": "The invention of the frequency-comb laser (Nobel Prize of Physics 2005 to Hänsch and Hall) has revolutionized the way the structure and dynamics of matter over a wide range of complexity can be investigated. These lasers produce ultrafast pulses (typically in the near-infrared), with a full control over phase and amplitude of electromagnetic waves. The pulses are produced at high repetition rate, so that the corresponding optical spectrum consists of an equidistant comb of highly accurately known frequencies. This offers the potential to obtain a sub-femtosecond resolution in the time domain and a spectral resolution of better than 10^-15 in the frequency domain.\n\nThe revolution this has caused does not stop at physics, nor is it limited to infrared or optical frequencies. Two fields are identified, seemingly opposite in complexity, where the potential impact of frequency-comb lasers is prominent. The first is structure and dynamics analysis of complex (bio-)molecules in the gas phase. To gain full control over the external and internal molecular degrees of freedom, and to localize and address individual molecules, it is proposed to sympathetically cool and trap them in laser-cooled ion-crystals. Combined with pulse-shaping (evolutionary optimization) and coherent multi-pulse excitation, it allows unique possibilities to study attosecond timescale electron dynamics in e.g. tryptophan, of one of the most important amino acids involved in biological electron-transfer processes.\n\nThe second line of research involves the electronic structure of the most simple atoms: hydrogen-like ions (He+, Li++ ...), also stored and cooled in an ion-trap. Compared to current measurements in hydrogen, it is expected that new tests of quantum-electrodynamics and nuclear size models can be performed in the search for physics beyond the `standard model'. The proposed excitation method is based on quantum-interference excitation with multiple extreme-ultraviolet and shorter wavelength pulses, obtained by harmonic up-conversion of amplified frequency-comb lasers.\n", "project_members": [ { "role": "Researcher", "member_id": 223065, "last_name": "Barmes", "degree_post_nominal": "BSc", "initials": "I.", "first_name": "Itan", "organisation": "Vrije Universiteit Amsterdam", "organisation_id": 4026, "ror": "https://ror.org/008xxew50", "active": false }, { "role": "Researcher", "member_id": 300276, "last_name": "Noom", "degree_post_nominal": "MSc", "initials": "D.W.E.", "first_name": "Daniel", "organisation": "Onbekend", "organisation_id": 5229, "ror": "-", "active": false }, { "role": "Researcher", "member_id": 218983, "last_name": "Morgenweg", "degree_post_nominal": "MSc", "initials": "J.", "first_name": "Jonas", "organisation": "Vrije Universiteit Amsterdam", "organisation_id": 4026, "ror": "https://ror.org/008xxew50", "active": false }, { "role": "Researcher", "member_id": 227169, "last_name": "Kandula", "degree_pre_nominal": "drs.", "initials": "D.", "first_name": "Dominik", "organisation": "Vrije Universiteit Amsterdam||Faculteit der Bètawetenschappen (Faculty of Science)||Afdeling Natuur- en Sterrenkunde (Physics and Astronomy)||Sterrenkunde en Atoomfysica", "organisation_id": 81430, "ror": "https://ror.org/008xxew50", "active": false }, { "role": "Researcher", "member_id": 208142, "last_name": "Pinkert", "degree_pre_nominal": "ir.", "initials": "T.J.", "first_name": "Tjeerd Jan", "organisation": "Vrije Universiteit Amsterdam||Faculteit der Bètawetenschappen (Faculty of Science)||Afdeling Natuur- en Sterrenkunde (Physics and Astronomy)", "organisation_id": 78939, "ror": "https://ror.org/008xxew50", "active": false }, { "role": "Project leader", "member_id": 187280, "last_name": "Eikema", "degree_pre_nominal": "prof. dr.", "initials": "K.S.E.", "first_name": "Kjeld", "organisation": "Vrije Universiteit Amsterdam||Faculteit der Bètawetenschappen (Faculty of Science)||Afdeling Natuur- en Sterrenkunde (Physics and Astronomy)||Sterrenkunde en Atoomfysica", "organisation_id": 81430, "ror": "https://ror.org/008xxew50", "active": false }, { "role": "Main Applicant", "member_id": 187280, "last_name": "Eikema", "degree_pre_nominal": "prof. dr.", "initials": "K.S.E.", "first_name": "Kjeld", "organisation": "NWO-institutenorganisatie||ARCNL - Advanced Research Center for Nanolithography||EUV Generation & Imaging", "organisation_id": 81523, "ror": "https://ror.org/04xe7ws48", "active": true } ], "products": [ { "title": "Direct frequency-comb spectroscopy of a dipole-forbidden clock transition in trapped 40Ca+ ions", "year": 2011, "edition": "36", "start": 49, "end": 51, "type": "Wetenschappelijk artikel", "journal_title": "Optics Letters", "authors": [ { "last_name": "Wolf", "initials": "A.L.", "role": "Auteur", "index_number": 0 }, { "last_name": "Morgenweg", "initials": "J.", "role": 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"role": "Maker", "index_number": 0 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 0 } ] }, { "title": "Direct frequency comb spectroscopy of trapped ions", "year": 2009, "type": "Overige Output", "authors": [ { "last_name": "Wolf", "initials": "A.L.", "role": "Maker", "index_number": 0 } ] }, { "title": "Extreme ultraviolet frequency comb metrology", "year": 2010, "edition": "105", "start": 63001, "type": "Wetenschappelijk artikel", "journal_title": "Physical Review Letters", "authors": [ { "last_name": "Gohle", "initials": "C", "role": "Auteur", "index_number": 0 }, { "last_name": "Kandula", "initials": "D.Z.", "role": "Auteur", "index_number": 0 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 0 }, { "last_name": "Pinkert", "initials": "T.J.", "role": "Auteur", "index_number": 0 }, { "last_name": "Ubachs", "initials": "W", "role": "Auteur", "index_number": 0 } ] }, { "title": "XUV Frequency Comb Spectroscopy", "year": 2011, "type": "Productbijdrage", "authors": [ { "last_name": "Gohle", "initials": "C.", "role": "Auteur", "index_number": 0 }, { "last_name": "Kandula", "initials": "D.Z.", "role": "Auteur", "index_number": 0 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 0 }, { "last_name": "Pinkert", "initials": "T.J.", "role": "Auteur", "index_number": 0 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 0 } ] }, { "title": "XUV frequency comb spectroscopy", "year": 2010, "type": "Productbijdrage", "authors": [ { "last_name": "Gohle", "initials": "C.", "role": "Auteur", "index_number": 0 }, { "last_name": "Kandula", "initials": "D.Z.", "role": "Auteur", "index_number": 0 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 0 }, { "last_name": "Pinkert", "initials": "T.J.", "role": "Auteur", "index_number": 0 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 0 } ] }, { "title": "Extreme ultraviolet frequency comb metrology", "year": 2010, "type": "Overige Output", "authors": [ { "last_name": "Gohle", "initials": "C.", "role": "Maker", "index_number": 0 } ] }, { "title": "XUV frequency comb spectroscopy", "year": 2009, "type": "Overige Output", "authors": [ { "last_name": "Gohle", "initials": "C.", "role": "Maker", "index_number": 0 } ] }, { "title": "Ultrafast double-pulse parametric amplification for precision Ramsey metrology", "year": 2008, "type": "Overige Output", "authors": [ { "last_name": "Kandula", "initials": "D.Z.", "role": "Maker", "index_number": 0 } ] }, { "title": "XUV frequency comb spectroscopy", "year": 2009, "type": "Overige Output", "authors": [ { "last_name": "Kandula", "initials": "D.Z.", "role": "Maker", "index_number": 0 } ] }, { "title": "XUV laser spectroscopy", "year": 2011, "edition": "1", "type": "Productbijdrage", "publisher": "Wiley-VCH", "authors": [ { "last_name": "Merkt", "initials": "F.", "role": "Editor", "index_number": 0 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 0 }, { "last_name": "Quack", "initials": "M.", "role": "Editor", "index_number": 0 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 0 } ] }, { "title": "Coherent XUV and X-ray generation with lasers", "year": 2010, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 0 } ] }, { "title": "Direct frequency comb spectroscopy from UV to XUV wavelengths", "year": 2010, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 0 } ] }, { "title": "Direct frequency comb spectroscopy of helium at 51 nm", "year": 2010, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 0 } ] }, { "title": "Extreme ultraviolet frequency comb metrology", "year": 2010, "type": "Overige 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metrology in the extreme ultraviolet", "year": 2011, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 0 } ] }, { "title": "Frequentiekamlasers - een revolutie in volle gang", "year": 2010, "type": "Publicatie", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 0 } ] }, { "title": "High precision laser experiments", "year": 2010, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 0 } ] }, { "title": "XUV frequency comb spectroscopy", "year": 2009, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 0 } ] }, { "title": "Phase stable parametric amplification and high-order harmonic generation providing a tunable XUV frequency comb", "year": 2010, "type": "Overige Output", "authors": [ { "last_name": "Pinkert", "initials": "T.J.", "role": "Maker", "index_number": 0 } ] }, { "title": "Widely-tunable mid-infrared frequency comb source based on difference frequency generation", "year": 2012, "edition": "37", "start": 2232, "end": 2234, "type": "Wetenschappelijk artikel", "journal_title": "Optics Letters", "authors": [ { "last_name": "Ruehl", "initials": "A.", "role": "Auteur", "index_number": 1 }, { "last_name": "Gambetta", "initials": "A.", "role": "Auteur", "index_number": 2 }, { "last_name": "Ingmar", "initials": "H.", "role": "Auteur", "index_number": 3 }, { "last_name": "Fermann", "initials": "M.E.", "role": "Auteur", "index_number": 4 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 5 }, { "last_name": "Marangoni", "initials": "M. ", "role": "Auteur", "index_number": 6 } ] }, { "title": "Frequency comb Synthesizer Tunable from 3 to 10 micron", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Ruehl", "initials": "A.", "role": "Maker", "index_number": 1 } ] }, { "title": "Widely Tunable Mid-Infrared Frequency Comb Synthesizer", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Ruehl", "initials": "A.", "role": "Maker", "index_number": 1 } ] }, { "title": "UV-frequency metrology on CO (a(3)Pi): isotope effects and sensitivity to a variation of the proton-to-electron mass ratio", "year": 2011, "edition": "84", "start": 52509, "end": 52509, "type": "Wetenschappelijk artikel", "journal_title": "Physical Review A", "authors": [ { "last_name": "de Nijs", "initials": "A.J.", "role": "Auteur", "index_number": 1 }, { "last_name": "Salumbides", "initials": "E.J.", "role": "Auteur", "index_number": 2 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 3 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 4 }, { "last_name": "Bethlem", "initials": "H.L.", "role": "Auteur", "index_number": 5 } ] }, { "title": "Direct frequency comb spectroscopy of a dipole-forbidden clock transition in trapped 40Ca+", "year": 2011, "type": "Overige Output", "authors": [ { "last_name": "Wolf", "initials": "A.L.", "role": "Maker", "index_number": 1 }, { "last_name": "Pinkert", "initials": "T.J.", "role": "Maker", "index_number": 2 }, { "last_name": "Koelemeij", "initials": "J.C.J.", "role": "Maker", "index_number": 3 }, { "last_name": "van den Berg", "initials": "S.A.", "role": "Maker", "index_number": 4 }, { "last_name": "Ubachs", "initials": "W.", "role": "Maker", "index_number": 5 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 6 } ] }, { "title": "High energy, high repetition rate picosecond pulses from a Quasi-CW diode pumped Nd:YAG system", "year": 2013, "edition": "38", "start": 3021, "end": 3023, "type": "Wetenschappelijk artikel", "journal_title": "Optics Letters", "authors": [ { "last_name": "Noom", "initials": "D.W.E.", "role": "Auteur", "index_number": 1 }, { "last_name": "Witte", "initials": "S.", "role": "Auteur", "index_number": 2 }, { "last_name": "Morgenweg", "initials": "J.", "role": "Auteur", "index_number": 3 }, { "last_name": "Altmann", "initials": "R.K.", "role": "Auteur", "index_number": 4 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 5 } ] }, { "title": "XUV frequency-comb metrology on the ground state of helium", "year": 2011, "edition": "84", "start": 62512, "end": 62512, "type": "Wetenschappelijk artikel", "journal_title": "Physical Review A", "authors": [ { "last_name": "Kandula", "initials": "D.Z.", "role": "Auteur", "index_number": 1 }, { "last_name": "Gohle", "initials": "C.", "role": "Auteur", "index_number": 2 }, { "last_name": "Pinkert", "initials": "T.J.", "role": "Auteur", "index_number": 3 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 4 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 5 } ] }, { "title": "XUV frequency comb metrology and the ground state of helium", "year": 2011, "edition": "1", "type": "Proefschrift", "url_open_access": "http://www.nat.vu.nl/en/Images/Kandula_Dominik_tcm69-249858.pdf", "city": "Amsterdam", "authors": [ { "last_name": "Kandula", "initials": "D.Z.", "role": "Auteur", "index_number": 1 } ] }, { "title": "Bounds on 5th forces from precise measurements on molecules", "year": 2013, "edition": "87", "start": 112008, "end": 112008, "type": "Wetenschappelijk artikel", "journal_title": "Physical Review D", "authors": [ { "last_name": "Salumbides", "initials": "E.J.", "role": "Auteur", "index_number": 1 }, { "last_name": "Koelemeij", "initials": "J.C.J.", "role": "Auteur", "index_number": 2 }, { "last_name": "Komassa", "initials": "J.", "role": "Auteur", "index_number": 3 }, { "last_name": "Pachucki", "initials": "K.", "role": "Auteur", "index_number": 4 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 5 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 6 } ] }, { "title": "High-precision frequency measurement of the 423-nm Ca I line", "year": 2011, "edition": "83", "start": 12502, "end": 12502, "type": "Wetenschappelijk artikel", "journal_title": "Physica Review A", "authors": [ { "last_name": "Salumbides", "initials": "E.J.", "role": "Auteur", "index_number": 1 }, { "last_name": "Maslinskas", "initials": "V.", "role": "Auteur", "index_number": 2 }, { "last_name": "Dildar", "initials": "I.M. 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"Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 6 } ] }, { "title": "Multi-delay, phase coherent pulse pair generation for precision Ramsey-comb spectroscopy", "year": 2013, "type": "Overige Output", "authors": [ { "last_name": "Morgenweg", "initials": "J.", "role": "Maker", "index_number": 1 } ] }, { "title": "Programmable mJ-Pulse Sequences from an 880 nm Pumped Nd:YVO4 Bounce Amplifier", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Morgenweg", "initials": "J.", "role": "Maker", "index_number": 1 } ] }, { "title": "Programmable mJ-pulse sequences from an 880 nm pumped Nd:YVO4 bounce amplifier", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Morgenweg", "initials": "J.", "role": "Maker", "index_number": 1 } ] }, { "title": "Ramsey-comb spectroscopy with amplified frequency comb pulse pairs", "year": 2013, "type": "Overige Output", "authors": [ { "last_name": "Morgenweg", "initials": "J.", "role": "Maker", "index_number": 1 } ] }, { "title": "Ramsey-comb spectroscopy", "year": 2013, "type": "Overige Output", "authors": [ { "last_name": "Morgenweg", "initials": "J.", "role": "Maker", "index_number": 1 } ] }, { "title": "Ramsey-comb spectroscopy", "year": 2013, "type": "Overige Output", "authors": [ { "last_name": "Morgenweg", "initials": "J.", "role": "Maker", "index_number": 1 } ] }, { "title": "Frequency combs liberated from material dispersion", "year": 2011, "edition": "5", "start": 258, "end": 260, "type": "Wetenschappelijk artikel", "journal_title": "Nature Photonics", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 1 } ] }, { "title": "Exciting frequency combs: why less can be more", "year": 2013, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Exciting frequency combs: why less can be more", "year": 2014, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Extreme Ultraviolet Frequency Comb Spectroscopy", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Frequency comb metrology up to PHz frequencies", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Hyper-fast meets hyper-precise", "year": 2011, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Hyper-fast meets hyperprecise", "year": 2011, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Precision spectroscopy with intense ultrafast laser pulses", "year": 2014, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Progress report from LLAMS", "year": 2014, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Ramsey-comb excitation from near-infrared to extreme ultraviolet", "year": 2014, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Ramsey-comb spectroscopy and spatial coherent control", "year": 2013, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Spatial and Spectral Coherent Control over Direct Frequency Comb Excitation", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Spatial and spectral coherent control over direct frequency comb excitation", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Spectroscopy at short wavelengths: from CW to Ramsey-comb excitation", "year": 2014, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Towards Extreme Ultraviolet Frequency Comb Spectroscopy of Helium+ Ions", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Transfer of precision: from fiber links to XUV frequency comb metrology", "year": 2011, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Ultra-fast meets ultra-precise", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Ultrafast meets ultra-precise", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "XUV frequency comb spectroscopy of helium and helium+ ions", "year": 2012, "type": "Overige Output", "authors": [ { "last_name": "Eikema", "initials": "K.S.E.", "role": "Maker", "index_number": 1 } ] }, { "title": "Precision spectroscopy of the X-1 Sigma(+)(g), v=0 -> 1 (J=0-2) rovibrational splittings in H2, HD and D2", "year": 2014, "edition": "300", "start": 44, "end": 54, "type": "Wetenschappelijk artikel", "journal_title": "Journal of Molecular Spectroscopy", "authors": [ { "last_name": "Niu", "initials": "M.L.", "role": "Auteur", "index_number": 1 }, { "last_name": "Salumbides", "initials": "E.J.", "role": "Auteur", "index_number": 2 }, { "last_name": "Dickenson", "initials": "G.D.", "role": "Auteur", "index_number": 3 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 4 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 5 } ] }, { "title": "Frequency metrology in Quantum degenerate helium: direct measurement of the 2(3)S(1) - 2(1)S(0) transition.", "year": 2011, "edition": "333", "start": 196, "end": 198, "type": "Wetenschappelijk artikel", "journal_title": "Science", "authors": [ { "last_name": "van Rooij", "initials": "R.", "role": "Auteur", "index_number": 1 }, { "last_name": "Borbely", "initials": "J.S.", "role": "Auteur", "index_number": 2 }, { "last_name": "Simonet", "initials": "J.", "role": "Auteur", "index_number": 3 }, { "last_name": "Hoogerland", "initials": "M.D.", "role": "Auteur", "index_number": 4 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 5 }, { "last_name": "Vassen", "initials": "W.", "role": "Auteur", "index_number": 6 } ] }, { "title": "Effect of soil temperature on optical frequency transfer through unidirectional dense-wavelength-division-multiplexing fiber-optic links", "year": 2015, "edition": "54", "start": 728, "end": 738, "type": "Wetenschappelijk artikel", "journal_title": "Applied Optics", "authors": [ { "last_name": "Pinkert", "initials": "T.J.", "role": "Auteur", "index_number": 1 }, { "last_name": "Jungmann", "initials": "K.", "role": "Auteur", "index_number": 10 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 11 }, { "last_name": "Koelemeij", "initials": "J.C.J.", "role": "Auteur", "index_number": 12 }, { "last_name": "Boll", "initials": "O", "role": "Auteur", "index_number": 2 }, { "last_name": "Willmann", "initials": "L.", "role": "Auteur", "index_number": 3 }, { "last_name": "Jansen", "initials": "G.S.M.", "role": "Auteur", "index_number": 4 }, { "last_name": "Dijck", "initials": "E.A.", "role": "Auteur", "index_number": 5 }, { "last_name": "Groeneveld", "initials": "B.G.H.", "role": "Auteur", "index_number": 6 }, { "last_name": "Smets", "initials": "R.", "role": "Auteur", "index_number": 7 }, { "last_name": "Bosveld", "initials": "F.C.", "role": "Auteur", "index_number": 8 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 9 } ] }, { "title": "Widely tunable extreme UV frequency comb generation", "year": 2011, "edition": "36", "start": 2026, "end": 2028, "type": "Wetenschappelijk artikel", "journal_title": "Optics Letters", "authors": [ { "last_name": "Pinkert", "initials": "T.J.", "role": "Auteur", "index_number": 1 }, { "last_name": "Kandula", "initials": "D.Z.", "role": "Auteur", "index_number": 2 }, { "last_name": "Gohle", "initials": "C.", "role": "Auteur", "index_number": 3 }, { "last_name": "Barmes", "initials": "I.", "role": "Auteur", "index_number": 4 }, { "last_name": "Morgenweg", "initials": "J.", "role": "Auteur", "index_number": 5 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 6 } ] }, { "title": "Frequency comb generation by CW laser injection into a quantum-dot mode-locked laser", "year": 2012, "edition": "20", "start": 21357, "end": 21371, "type": "Wetenschappelijk artikel", "url_open_access": "http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-19-21357", "journal_title": "Optics Express", "authors": [ { "last_name": "Pinkert", "initials": "T.J.", "role": "Auteur", "index_number": 1 }, { "last_name": "Salumbides", "initials": "E.J.", "role": "Auteur", "index_number": 2 }, { "last_name": "Tahvilli", "initials": "M.S.", "role": "Auteur", "index_number": 3 }, { "last_name": "Ubachs", "initials": "W.", "role": "Auteur", "index_number": 4 }, { "last_name": "Bente", "initials": "E.A.J.M.", "role": "Auteur", "index_number": 5 }, { "last_name": "Eikema", "initials": "K.S.E.", "role": "Auteur", "index_number": 6 } ] }, { "title": "Widely tunable extreme ultraviolet frequency comb generation", "year": 2011, "type": "Overige Output", "authors": [ { "last_name": "Pinkert", "initials": "T.J.", "role": "Maker", "index_number": 1 } ] }, { "title": "Extreme-ultraviolet frequency combs: ultra-fast meets ultra-precise", "year": 2011, "type": "Overige Output" }, { "title": "Frequency comb metrology in the extreme ultraviolet", "year": 2011, "type": "Overige Output" }, { "title": "Ultra-fast meets ultra-precise", "year": 2011, "type": "Overige Output" } ] }, { "project_id": "680-47-502", "title": "Visualization of charge transport through single molecules", "funding_scheme_id": 855, "funding_scheme": "NWO-Talentprogramma Vidi 2009 N", "department": "Exacte en Natuurwetenschappen", "sub_department": "Natuurkunde", "start_date": "2010-06-01T00:00:00", "end_date": "2016-03-31T00:00:00", "reporting_year": 2009, "summary_nl": "I propose to investigate the conductance properties of single molecules in a radically new way, by utilizing LEEM (low-energy electron microscopy) and PEEM (photo-electron emission microscopy). Up to now, molecular electronics has suffered from the problem that it is impossible to 'see' if a molecule is actually present. Using LEEM/PEEM, I shall change that situation. I will both visualize and fundamentally study electron transport through single molecules. If I succeed, I will open a powerful new research field, as this technique will enable accurate transport studies in a broad set of fascinating systems. Simultaneously, my work will imply the breakthrough of LEEM and PEEM, which are rooted in surface science, to a much broader physics community. \nMy approach is to exploit the sensitivity of LEEM and PEEM to the local sample potential, to visualize charge transport in two-dimensional systems under a voltage bias. To specifically study transport through molecules, I shall therefore 'spread out' a set of molecular junctions in a two-dimensional structure. PEEM will also be used in a complementary way, i.e. to determine the energy levels of molecules coupled to gold. By combining molecular transport data, energy level information and additional optical spectroscopy (UV-Vis, infrared and Raman) a comprehensive data set is constructed that is exceptional in the field of molecular transport. Taking advantage of this opportunity, I will systematically investigate the influence of molecular conjugation and metal-molecule coupling on charge transport through molecules. My fundamental studies therefore relate to the technologically relevant question if we can manipulate molecular conductance properties by the proximity of other molecules or by external stimuli such as light.", "summary_en": "I propose to investigate the conductance properties of single molecules in a radically new way, by utilizing LEEM (low-energy electron microscopy) and PEEM (photo-electron emission microscopy). Up to now, molecular electronics has suffered from the problem that it is impossible to 'see' if a molecule is actually present. Using LEEM/PEEM, I shall change that situation. I will both visualize and fundamentally study electron transport through single molecules. If I succeed, I will open a powerful new research field, as this technique will enable accurate transport studies in a broad set of fascinating systems. Simultaneously, my work will imply the breakthrough of LEEM and PEEM, which are rooted in surface science, to a much broader physics community. \nMy approach is to exploit the sensitivity of LEEM and PEEM to the local sample potential, to visualize charge transport in two-dimensional systems under a voltage bias. To specifically study transport through molecules, I shall therefore 'spread out' a set of molecular junctions in a two-dimensional structure. PEEM will also be used in a complementary way, i.e. to determine the energy levels of molecules coupled to gold. By combining molecular transport data, energy level information and additional optical spectroscopy (UV-Vis, infrared and Raman) a comprehensive data set is constructed that is exceptional in the field of molecular transport. Taking advantage of this opportunity, I will systematically investigate the influence of molecular conjugation and metal-molecule coupling on charge transport through molecules. My fundamental studies therefore relate to the technologically relevant question if we can manipulate molecular conductance properties by the proximity of other molecules or by external stimuli such as light.", "project_members": [ { "role": "Researcher", "member_id": 275058, "last_name": "Thete", "degree_pre_nominal": "dr.", "initials": "A.", "first_name": "Aniket", "organisation": "Universiteit Leiden||Faculteit der Wiskunde en Natuurwetenschappen", "organisation_id": 55707, "ror": "https://ror.org/027bh9e22", "active": false }, { "role": "Researcher", "member_id": 283552, "last_name": "Kaliginedi", "degree_pre_nominal": "dr.", "initials": "B.", "first_name": "Bhadra", "organisation": "Onbekend", "organisation_id": 5229, "ror": "-", "active": false }, { "role": "Researcher", "member_id": 248255, "last_name": "Guédon", "degree_pre_nominal": "drs.", "initials": "C.", "first_name": "Constant", "organisation": "Universiteit Leiden||Faculteit der Wiskunde en Natuurwetenschappen||Biofysica B", "organisation_id": 73951, "ror": "https://ror.org/027bh9e22", "active": false }, { "role": "Researcher", "member_id": 234283, "last_name": "Kautz", "degree_pre_nominal": "drs.", "initials": "J.", "first_name": "Jaap", "organisation": "Universiteit Leiden", "organisation_id": 38568, "ror": "https://ror.org/027bh9e22", "active": false }, { "role": "Project leader", "member_id": 139084, "last_name": "Molen", "degree_pre_nominal": "prof. dr. ir.", "initials": "S.J.", "first_name": "Sense Jan", "prefix": "van der", "organisation": "Universiteit Leiden||Faculteit der Wiskunde en Natuurwetenschappen||Leiden Probe Microscopy||Kamerlingh Onnes Laboratory", "organisation_id": 74922, "ror": "https://ror.org/027bh9e22", "active": false }, { "role": "Researcher", "member_id": 139084, "last_name": "Molen", "degree_pre_nominal": "prof. dr. ir.", "initials": "S.J.", "first_name": "Sense Jan", "prefix": "van der", "organisation": "Universiteit Leiden||Faculteit der Wiskunde en Natuurwetenschappen||Leiden Probe Microscopy||Kamerlingh Onnes Laboratory", "organisation_id": 74922, "ror": "https://ror.org/027bh9e22", "active": false }, { "role": "Main Applicant", "member_id": 139084, "last_name": "Molen", "degree_pre_nominal": "prof. dr. ir.", "initials": "S.J.", "first_name": "Sense Jan", "prefix": "van der", "organisation": "Universiteit Leiden||Faculteit der Wiskunde en Natuurwetenschappen||Leids Instituut voor Onderzoek in de Natuurkunde (LION)||Huygens-Kamerlingh Onnes Laboratorium", "organisation_id": 52382, "ror": "https://ror.org/027bh9e22", "active": true } ], "products": [ { "title": "Charge transport through molecular switches\nnone", "sub_title": "none", "year": 2010, "edition": "22", "start": 133001, "end": 30, "type": "Wetenschappelijk artikel", "journal_title": "Journal of Physics: Condensed Matter", "authors": [ { "last_name": "Liljeroth", "initials": "P", "first_name": "Peter", "role": "Auteur", "index_number": 2 }, { "last_name": "Molen", "initials": "S.J. ", "first_name": "Sense Jan", "prefix": "van der", "role": "Auteur", "index_number": 1 } ] }, { "title": "Oppervlakken filmen met trage elektronen", "year": 2010, "start": 332, "end": 336, "type": "Wetenschappelijk artikel", "journal_title": "Nederlands Tijdschrift voor Natuurkunde", "authors": [ { "last_name": "Gastel", "initials": "R.", "first_name": "Raoul", "prefix": "van", "role": "Auteur", "index_number": 0 }, { "last_name": "Tromp", "initials": "R.M.", "first_name": "Ruud", "role": "Auteur", "index_number": 0 }, { "last_name": "Molen", "initials": "S.J. ", "first_name": "Sense Jan", "prefix": "van der", "role": "Auteur", "index_number": 0 } ] }, { "title": "Low energy electron microscopy imaging using Medipix2 detectors.", "year": 2011, "edition": "633", "start": 239, "end": 242, "type": "Wetenschappelijk artikel", "journal_title": "Nucl. Instr. and Meth. in Phys. Res", "authors": [ { "last_name": "Molen", "initials": "S.J. 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