2022 Fiscal Year Final Research Report
Observation of Quantum Dynamics of Physically Adsorbed Hydrogen Molecules by Nonlinear molecular Spectroscopy
| Project/Area Number |
21K18896
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 29:Applied condensed matter physics and related fields
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| Research Institution | Institute for Molecular Science |
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Principal Investigator |
Sugimoto Toshiki 分子科学研究所, 物質分子科学研究領域, 准教授 (00630782)
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| Co-Investigator(Kenkyū-buntansha) |
國貞 雄治 北海道大学, 工学研究院, 助教 (00591075)
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| Project Period (FY) |
2021-07-09 – 2023-03-31
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| Keywords | 固体表面 / 非線形分光法 / 量子ダイナミクス / 水素分子 |
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| Outline of Final Research Achievements |
In this study, we have completed the setup of an optical system for nonlinear ro-vibrational spectroscopy based on a Ti:sapphire laser. We have investigated nonlinear spectroscopy scheme based on (1) supercontinuum light generated by third-order nonlinear phenomena, (2) impulsive excitation using femtosecond ultrashort pulse lasers, and (3) hybridization of the two schemes. Both of the two methods are feasible. A new nonlinear spectroscopy chamber was designed and developed to enable cryogenic cooling of samples and precise control of the number of adsorbed molecules, and highly sensitive measurement of vibrational rotation lines for N2, O2, H2, and D2 gas molecules was successfully performed.
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| Free Research Field |
表面界面科学、分光学、分子科学、物理化学
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| Academic Significance and Societal Importance of the Research Achievements |
固体表面のin-situ観測に従来から広く用いられてきた赤外分光法では等核二原子分子である水素分子を多くの場合検出できず，また，NMRや中性子線散乱・自発ラマン分光では表面1分子層(数密度nmol/cm2程度)以下の微量の吸着水素分子の計測が困難である。特殊な電子共鳴効果やプラズモン電場増強効果を使用すること無しに表面1分子層の吸着系に対する非線形ラマンスペクトルを測定することに成功した。これにより、固体表面吸着分子の量子ダイナミクスの差異を非破壊かつ高感度に非線形ラマン分光で直接観測する新たな方向性を開拓することができた。
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