イワクラ イズミ   Iwakura Izumi
  岩倉 いずみ
   所属   神奈川大学  工学部 化学教室
    神奈川大学大学院  工学研究科 工学専攻(応用化学領域)
   職種   教授
言語種別 英語
発行・発表の年月 2013/08
形態種別 学術雑誌
査読 査読あり
標題 A new reaction mechanism of Claisen rearrangement induced by few-optical-cycle pulses: demonstration of non-thermal chemistry by femtosecond vibrational spectroscopy
執筆形態 共著
掲載誌名 Pure and applied Chemistry
掲載区分国外
巻・号・頁 85,pp.1991-2004
著者・共著者 Izumi Iwakura, Atsushi Yabushita, Jun Liu, Kotaro Okamura, Satoko Kezuka, Takayoshi Kobayashi
概要 Time-resolved vibration spectroscopy is the only known way to directly observe reaction processes. In this work, we measure time-resolved vibration spectra of the Claisen rearrangement triggered and observed by few-optical-cycle pulses. Changes in molecular structure during the reaction, including its transition states (TSs), are elucidated by observing the transient changes of molecular vibration wavenumbers. We pump samples with visible ultrashort pulses of shorter duration than the molecular vibration period, and with photon energies much lower than the minimum excitation energy of the sample. The results indicate that the "nonthermal Claisen rearrangement can be triggered by visible few-optical-cycle pulses exciting molecular vibrations in the electronic ground state of the sample, which replaces the typical thermal Claisen rearrangement.