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    "api_type": "NWO Projects API",
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    "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": "2026-11-04T00:00:00",
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  "projects": [
    {
      "project_id": "700.59.023",
      "title": "The complete experiment: Full 3D Quantum Imaging of a Photochemical Reaction",
      "funding_scheme_id": 30,
      "funding_scheme": "ECHO chemie in relatie met fysica/materialen 2009 CW",
      "department": "Exacte en Natuurwetenschappen",
      "sub_department": "Chemische Wetenschappen",
      "start_date": "2013-05-01T00:00:00",
      "end_date": "2013-12-31T00:00:00",
      "reporting_year": 2010,
      "summary_nl": "Here we propose to study experimentally for the first time the full and complete quantum character of a photochemical bondbreaking process in a polyatomic molecule. We will image the full three-dimensional (3D) angular differential scattering cross section of correlated molecular and atomic fragments with complete selectivity of and sensitivity to the full quantum character of all particles involved. The proposed research will establish firm and unprecedented experimental benchmark systems for ab initio quantum theory. We aim to foster our fundamental understanding of unimolecular scattering and to stimulate quantum computational efforts to test and improve the accuracy and methodology of in silico quantum chemistry.\n\nSeveral innovations developed in our laboratory over the last three years will be combined for this experimental effort to image in full three-dimensions the complete quantum character of a photon induced molecular scattering event. We will select and control the complete internal and external (orientational) quantum degrees of freedom of the initial parent molecule. Then we will use a coherent, polarized and energy selective laser pulse for molecular excitation that induces bond breaking. A second frequency selective polarized coherent light pulse will be used for 3D detection of the fragments, employing high-speed high-resolution slice imaging. \n\nOur experimental innovations will allow us to perform the proposed experiments at a two orders of magnitude higher duty cycle than has been possible up to now. The resulting order of magnitude increase in signal-to-noise ratio makes it possible to produce data of exceptional quality and at an exceptionally detailed level of quantum selectivity, also called `the complete experiment`. \n\nIn particular, we will select different initial quantum states of the parent molecule and we will vary the photolysis energy, so that we explore different regions of the potential energy surfaces involved. Furthermore, for the systems to be studied it also provides a sensitive test of the transition dipole moment function as a function of internal geometry of the molecule.\n\nOf special interest will be interference and coherence phenomena that can be observed in the anisotropy of angular momenta of correlated photofragment channels. We will focus on disentangling the underlying mechanism being either of quantum character (interference) or of classical nature. The new measurements will provide extremely sensitive tests of the quality of ab initio quantum theoretical structure and dynamics calculations. We will obtain detailed vector correlations in the molecular frame between permanent dipole moment, transition dipole moment, nonaxial recoil velocity and fragment polarization. \n\nFor the systems to be studied it will test quantum theory where a breakdown of the Born-Oppenheimer approximation is present. The coherent excitation of multiple surfaces and nonadiabatic exit channel interaction need to be incorporated, i.e. full electronic ab initio structure and nonadiabatic dynamical theory will be tested.\n\nOur goal is to establish chemical benchmark systems and experimental data for unimolecular polyatomic photochemistry that will serve to test and foster progress in ab initio quantum chemical theory in the 21st century.\n",
      "summary_en": "Here we propose to study experimentally for the first time the full and complete quantum character of a photochemical bondbreaking process in a polyatomic molecule. We will image the full three-dimensional (3D) angular differential scattering cross section of correlated molecular and atomic fragments with complete selectivity of and sensitivity to the full quantum character of all particles involved. The proposed research will establish firm and unprecedented experimental benchmark systems for ab initio quantum theory. We aim to foster our fundamental understanding of unimolecular scattering and to stimulate quantum computational efforts to test and improve the accuracy and methodology of in silico quantum chemistry.\n\nSeveral innovations developed in our laboratory over the last three years will be combined for this experimental effort to image in full three-dimensions the complete quantum character of a photon induced molecular scattering event. We will select and control the complete internal and external (orientational) quantum degrees of freedom of the initial parent molecule. Then we will use a coherent, polarized and energy selective laser pulse for molecular excitation that induces bond breaking. A second frequency selective polarized coherent light pulse will be used for 3D detection of the fragments, employing high-speed high-resolution slice imaging. \n\nOur experimental innovations will allow us to perform the proposed experiments at a two orders of magnitude higher duty cycle than has been possible up to now. The resulting order of magnitude increase in signal-to-noise ratio makes it possible to produce data of exceptional quality and at an exceptionally detailed level of quantum selectivity, also called `the complete experiment`. \n\nIn particular, we will select different initial quantum states of the parent molecule and we will vary the photolysis energy, so that we explore different regions of the potential energy surfaces involved. Furthermore, for the systems to be studied it also provides a sensitive test of the transition dipole moment function as a function of internal geometry of the molecule.\n\nOf special interest will be interference and coherence phenomena that can be observed in the anisotropy of angular momenta of correlated photofragment channels. We will focus on disentangling the underlying mechanism being either of quantum character (interference) or of classical nature. The new measurements will provide extremely sensitive tests of the quality of ab initio quantum theoretical structure and dynamics calculations. We will obtain detailed vector correlations in the molecular frame between permanent dipole moment, transition dipole moment, nonaxial recoil velocity and fragment polarization. \n\nFor the systems to be studied it will test quantum theory where a breakdown of the Born-Oppenheimer approximation is present. The coherent excitation of multiple surfaces and nonadiabatic exit channel interaction need to be incorporated, i.e. full electronic ab initio structure and nonadiabatic dynamical theory will be tested.\n\nOur goal is to establish chemical benchmark systems and experimental data for unimolecular polyatomic photochemistry that will serve to test and foster progress in ab initio quantum chemical theory in the 21st century.\n",
      "project_members": [
        {
          "role": "Researcher",
          "member_id": 270518,
          "last_name": "Kashyap",
          "degree_post_nominal": "MSc",
          "initials": "P.K.",
          "first_name": "Pradeep",
          "organisation": "Vrije Universiteit Amsterdam||Faculteit der Bètawetenschappen (Faculty of Science)||Ultrafast Laser Physics and Precision Metrology Group",
          "organisation_id": 77034,
          "ror": "https://ror.org/008xxew50",
          "active": false
        },
        {
          "role": "Project leader",
          "member_id": 179724,
          "last_name": "Janssen",
          "degree_pre_nominal": "dr.",
          "initials": "M.H.M.",
          "first_name": "Maurice",
          "organisation": "Vrije Universiteit Amsterdam||Faculteit der Bètawetenschappen (Faculty of Science)||Afdeling Scheikunde & Farmaceutische Wetenschappen||Fysische Chemie",
          "organisation_id": 80629,
          "ror": "https://ror.org/008xxew50",
          "active": false
        },
        {
          "role": "Main Applicant",
          "member_id": 179724,
          "last_name": "Janssen",
          "degree_pre_nominal": "dr.",
          "initials": "M.H.M.",
          "first_name": "Maurice",
          "organisation": "Vrije Universiteit Amsterdam||Faculteit der Bètawetenschappen (Faculty of Science)||Afdeling Natuur- en Sterrenkunde (Physics and Astronomy)||Atoms, Molecules and Lasers",
          "organisation_id": 80628,
          "ror": "https://ror.org/008xxew50",
          "active": true
        }
      ]
    }
  ]
}