In-situ nonlinear Raman spectroscopic observation of nuclear spin conversion process of molecular hydrogen on the surface of interstellar dust

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K22540
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
• Research Institution: Institute for Molecular Science
• Principal Investigator: Tsuruoka Kazuyuki 分子科学研究所, 物質分子科学研究領域, 特任研究員 (80884775)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Keywords: 非線形分光 / 水素分子 / 星間塵

Outline of Final Research Achievements

We have completed the setup of an optical system for nonlinear Raman spectroscopy using a Ti:sapphire laser (800 nm) owned by our laboratory. Both the multiplexing method using supercontinuum light and the impulsive excitation method using femtosecond ultrashort pulse lasers are now available. Nonlinear Raman spectra of ice films and hydrogen gas molecules were successfully measured in the apparatus that reproduces the temperature and pressure conditions of a model system for interstellar molecular cloud environments.

Free Research Field

表面科学

Academic Significance and Societal Importance of the Research Achievements

星間分子雲に存在する水素分子の赤外観測情報は、周囲環境の過去の情報を持ち、分子雲の年齢や星形成メカニズムの解明のための鍵となる。本研究で用いた非線形ラマン分光により、従来の実験手法では困難であった等核二原子分子吸着種の量子状態・量子ダイナミクスをラボ実験 により明らかにでき、宇宙空間での星形成メカニクスの解明に演繹することができると期待される。