Laser control of reactions of photoswitching functional molecules

Hiroyuki Tamura, Shinkoh Nanbu, Toshimasa Ishida, Hiroki Nakamura

    Research output: Contribution to journalArticle

    28 Citations (Scopus)

    Abstract

    Laser control schemes of reactions of photoswitching functional molecules are proposed based on the quantum mechanical wave-packet dynamics and the design of laser parameters. The appropriately designed quadratically chirped laser pulses can achieve nearly complete transitions of wave packet among electronic states. The laser parameters can be optimized by using the Zhu-Nakamura theory of nonadiabatic transition. This method is effective not only for the initial photoexcitation process but also for the pump and dump scheme in the middle of the overall photoswitching process. The effects of momentum of the wave packet crossing a conical intersection on the branching ratio of products have also been clarified. These control schemes mentioned above are successfully applied to the cyclohexadiene/hexatriene photoisomerization (ring-opening) process which is the reaction center of practical photoswitching molecules such as diarylethenes. The overall efficiency of the ring opening can be appreciably increased by using the appropriately designed laser pulses compared to that of the natural photoisomerization without any control schemes.

    Original languageEnglish
    Article number034307
    JournalJournal of Chemical Physics
    Volume125
    Issue number3
    DOIs
    Publication statusPublished - 2006 Aug 1

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

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