Resonance de-enhancement in the 21Ag state of trans-azobenzene

Biswas, Nandita ; Umapathy, Siva (1997) Resonance de-enhancement in the 21Ag state of trans-azobenzene Pramana - Journal of Physics, 48 (4). pp. 937-950. ISSN 0304-4289

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We analyze the origin of de-enhancement for a number of vibrational modes in the 21 A g excited state of trans-azobenzene. We have used the time-dependent wave packet analysis of the RR intensities by including the multimode damping effects in the calculation. This avoids the use of unrealistically large values for the damping parameter. It is concluded that the de-enhancement is caused by the interference between the two uncoupled electronic states, and that the intensities observed under the so-called symmetry forbidden 21 A g ← 11 A g transition are purely due to resonance excitation. It is also observed that the use of the time-dependent approach to study the de-enhancement effects caused by multiple electronic states on the RR intensities is not necessarily useful if one is interested in the structural dynamics.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Resonance Raman Intensities; De-enhancement; Time-dependent Wave-packet Analysis; Trans-azobenzene
ID Code:64953
Deposited On:15 Oct 2011 12:31
Last Modified:18 May 2016 13:11

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