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Resonance de-enhancement in the 2(1)A(g) state of trans-azobenzene

Biswas, Nandita and Umapathy, Siva (1997) Resonance de-enhancement in the 2(1)A(g) state of trans-azobenzene. In: Pramana - Journal of Physics, 48 (4). pp. 937-950.

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Abstract

We analyze the origin of de-enhancement for a number of vibrational modes in the 2(1)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 2(1)A(g) <-- 1(1)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: Journal Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Resonance Raman intensities;de-enhancement;time-dependent wave-packet analysis;trans-azobenzene.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 30 Jun 2011 12:57
Last Modified: 30 Jun 2011 12:57
URI: http://eprints.iisc.ernet.in/id/eprint/38389

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