The Phosphorescence Excitation Spectrum of Jet-Cooled Xanthione in the Region of the T1←S0 and S1←S0 Absorption Transitions |
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| Authors: | R.P BrintW.G Doherty A.A Ruth |
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| Affiliation: | Department of Chemistry, National University of Ireland, University College Cork, Cork, Ireland |
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| Abstract: | The 3A2(nπ*)→1A1X (T1→S0) phosphorescence excitation spectrum of jet-cooled xanthione was investigated in the region 14 920-17 600 cm−1. The structure observed is shown to be due to the T1←S0 absorption and an assignment in terms of the vibronic structure of that band is proposed. A previous assignment of the S1←S0 origin is considered in detail and the transition involved is shown to be most probably due to absorption of a vibronic triplet state T1z,ν7. An alternative but tentative assignment of the S1,0←S0,0 transition is suggested. Comparison is made with previous spectroscopic and theoretical work on the molecule and its congeners, 4H-pyran-4-thione and 4H-1-benzopyran-4-thione. |
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| Keywords: | xanthione |
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