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Non-radiative relaxation of the excited à 1B2u state of benzene

✍ Scribed by J.H. Callomon; J.E. Parkin; R. Lopez-Delgado

Publisher
Elsevier Science
Year
1972
Tongue
English
Weight
822 KB
Volume
13
Category
Article
ISSN
0009-2614

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✦ Synopsis

Many but not al! bands of the 2600 A absorption system of benzene involving vibrational levels m&e than 3000 cm-l above the zerepoint level of the ,excited state are seen to be more or less diffuse when photographed under very high resolution This threshold lies almost exactly at the hkhest level above zerc-point from which.resonance fluorescence can be excited and indicates the sharply defined onset of a non-radiative relaxation process three orders of magnitude faster than the one leading to intersystem crossing at lower energies. Possible mechanisms are discussed. Predissociation appears to be ruled out by photochemical experimdnts.

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