Dual fluorescence of pyrazine cooled in a supersonic free jet.

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概要

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• The fluorescence excitation spectrum of the lowest excited <SUP>1</SUP>B<SUB>3u</SUB>(n π<SUP>*</SUP>) state of pyrazine cooled in a pulsed supersonic free jet was observed. The fluorescence decay of the isolated molecule was also measured in the free jet. The rotationally cooled pyrazine in the collision free condition exhibits extremely large fluorescence quantum yield and dominant slow fluorescence component for low lying vibronic levels. The ratio of the pre-exponential factors of the dual fluorescence decay was examined in terms of the available theory of singlet-triplet mixed state model. It was found that the number of coupled triplet levels obtained from the observed ratio is inconsistent with the calculated excess energy dependence of vibronic density in the triplet state. Remarkable rotational level dependence of the ratio of the pre-exponential factors was observed for the electronic origin, while such a rotational dependence was not found for the lifetime of the slow fluorescence.

• 公益社団法人 日本化学会の論文

著者

• Ito Mitsuo

  Department Of Chemistry And Fuel Research Japan Atomic Energy Research Institute

• Kaya Koji

  Department Of Chemistry Faculty Of Science And Technology Keio University

• Mikami Naohiko

  Department of Chemistry and Radiation Laboratory, University of Notre Dame

• Igarashi Hisao

  Department of Chemistry, Faculty of Science, Tohoku University

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