Development of a novel reaction by coherent molecular vibration different from conventional photoreactions and thermal reactions

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22174
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 32:Physical chemistry, functional solid state chemistry, and related fields
• Research Institution: Kanagawa University
• Principal Investigator: Iwakura Izumi 神奈川大学, 工学部, 教授 (40517083)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: フェムト秒レーザー光 / 極限的超短パルス光 / 振動励起

Outline of Final Research Achievements

The Raman active molecular vibrational modes are coherently excited by sub-10-fs pulse laser whose duration is shorter than the molecular vibrational period, which triggers the reaction while maintaining coherence between the molecular vibrational modes. Thus, all of the excited molecules participate in the reaction in phase, which induces coherence in the reaction. In this work, by applying the coherent molecular vibrational excitation, control of a photochemical reaction was studied. The reaction dynamics after photoexcitation of biantril was analyzed. As a result of inducing the dissociation of biantril by two-step excitation, the dissociation product amount changed depending on the time difference between the two pulses.

Free Research Field

レーザー化学

Academic Significance and Societal Importance of the Research Achievements

レーザー光の特徴を活かした化学反応制御は新しい研究分野になり得ると、半世紀以上に渡り様々な研究がなされてきた。本研究では、有機分子の分子振動周期よりも閃光時間が短いサブ10-fs光を用いる「コヒーレント分子振動励起」を応用することで、ビアントリルの光反応を制御した。数年、もしくは十数年後、さらにサブ10-fs光が安定化し、レーザー光の専門家以外でも日常的に扱えるようになった暁には、レーザー光の特徴を活かした化学反応制御が合成手法の一つとして利用されることを期待する。