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Author Horio, Takuya ♦ Spesyvtsev, Roman ♦ Nagashima, Kazuki ♦ Ingle, Rebecca A. ♦ Suzuki, Yoshi-ichi ♦ Suzuki, Toshinori
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ CONFIGURATION INTERACTION ♦ EXPERIMENTAL DATA ♦ INTERNAL CONVERSION ♦ PYRAZINES ♦ RADIATIONLESS DECAY ♦ WAVE FUNCTIONS
Abstract A photoexcited molecule undergoes multiple deactivation and reaction processes simultaneously or sequentially, which have been observed by combinations of various experimental methods. However, a single experimental method that enables complete observation of the photo-induced dynamics would be of great assistance for such studies. Here we report a full observation of cascaded electronic dephasing from S{sub 2}(ππ{sup *}) in pyrazine (C{sub 4}N{sub 2}H{sub 4}) by time-resolved photoelectron imaging (TRPEI) using 9.3-eV vacuum ultraviolet pulses with a sub-20 fs time duration. While we previously demonstrated a real-time observation of the ultrafast S{sub 2}(ππ{sup *}) → S{sub 1}(nπ{sup *}) internal conversion in pyrazine using TRPEI with UV pulses, this study presents a complete observation of the dynamics including radiationless transitions from S{sub 1} to S{sub 0} (internal conversion) and T{sub 1}(nπ{sup *}) (intersystem crossing). Also discussed are the role of {sup 1}A{sub u}(nπ{sup *}) in the internal conversion and the configuration interaction of the S{sub 2}(ππ{sup *}) electronic wave function.
ISSN 00219606
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-28
Publisher Place United States
Journal Journal of Chemical Physics
Volume Number 145
Issue Number 4


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