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The 1B1u ← 1A1g 0—0 transition in crystal benzene

✍ Scribed by J.B. Birks; E. Pantos; T.D.S. Hamilton

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
257 KB
Volume
21
Category
Article
ISSN
0009-2614

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✦ Synopsis

The transition linewidth AE in crystal C I' 6 J6, C6D6 and symC6H3D3 has been measured as a function of temperature T from 4.2 to 135"K, and it extrapolates to a common value of tie = 50 cm-' at 0°K. In CbH6 aE = (50+ 7T"2) cm-', indicative of strong cxciton-phonon couplin g, and there is a line shift of +40 cm-' per substituent deuteron. Fluorescence excitation spectral data are used to separate the 'B I" (= Sz) decay rate kH = 9.4 X 101' set-', derived from AEo, into Sz-Si internal conversion (rate = 6.6 X 10" set-') and S;?-S, (channel 3) internal conversion (rate = 2.8 X lO'2 set-'). A similar value of kH = 9.9 X 1012 set -' is obtained from the S2-So fluorescence quantum yield of liquid benzene.

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