| Project/Area Number |
20K15229
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 32010:Fundamental physical chemistry-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | electron spectroscopy / electron scattering / liquid water / aqueous solution / angular anisotropy / photoelectron anisotropy / synchrotron radiation |
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| Outline of Research at the Start |
Important for many chemical and biological processes is a solute’s propensity vs. depth and its orientation at the surface, which is measured with photoelectron spectroscopy by exploiting electron scattering. We quantify how electrons scatter and loose energy in aqueous solutions for this purpose.
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| Outline of Final Research Achievements |
Liquid-jet photoelectron spectroscopy is routinely used to study the surface propensity and orientation of solutes in aqueous solutions, which relies on the inelastic scattering of the photoelectron within the solvent. However, our understanding of electron scattering in liquids is lacking, which hinders the interpretation of spectra and extraction of depth information. This project succeeded in mapping the electron scattering over a wide range of energies for the first time. It was revealed that vibrational scattering dominates below kinetic energies of ~16 eV, which strongly affects the photoelectron spectrum unless the solute is surface-active. This is important for low-energy experiments, such as laser-based studies. Furthermore, a method of interpreting the angular anisotropy of photoelectrons from molecules with site-specify was developed, which makes it possible to determine a solute’s depth and orientation on the solution surface with near atomic precision.
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| Academic Significance and Societal Importance of the Research Achievements |
The distribution of solutes at a solution’s surface is important for atmospheric processes and chemistry. This project advanced our understanding of electron scattering in liquids, which enables to extract depth and surface orientation of molecules with high precision via photoelectron spectroscopy.
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