Investigating the shape of reactive potential energy surfaces using ultrafast coherent vibrational spectroscopy

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01895
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 32010:Fundamental physical chemistry-related
• Research Institution: Institute for Molecular Science
• Principal Investigator: Kuramochi Hikaru 分子科学研究所, 協奏分子システム研究センター, 准教授 (40709367)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 超高速分光 / 電子励起状態 / 多次元分光 / コヒーレンス / 非線形分光 / ラマン分光

Outline of Final Research Achievements

We developed a new light source to generate <10 fs pulses in the ultraviolet to near-infrared region. Based on this light source, two-dimensional Raman spectroscopy for observing the couplings between excited-state vibrational modes and a pump-probe spectroscopy with extreme time resolution have been developed. In 2D Raman spectroscopy of TIPS-pentacene, a typical system that shows singlet exciton fission, the obtained data suggested the existence of couplings between the excited-state vibrational modes, which cannot be explained by a simple harmonic oscillator model. The present project succeeded in establishing a technological basis for obtaining new knowledge on electronic excited states that cannot be obtained by conventional methods.

Free Research Field

物理化学

Academic Significance and Societal Importance of the Research Achievements

電子励起状態における振動モード間のカップリングは，反応が起こるポテンシャルエネルギー曲面の形状を決定づける重要なパラメータであるが，従来の実験手法ではこうした情報を得ることは極めて困難であった．本研究で開発を進めた新しい分光手法によってこうした情報が実験的に得られるようになったことは，大きな学術的意義がある．先端的な分光計測法の開発により，化学反応ダイナミクス研究の新しい可能性を開拓した．