, Volume 48, Issue 4, pp 937–950 | Cite as

Resonance de-enhancement in the 21 A g state oftrans-azobenzene

  • Nandita Biswas
  • Siva UmapathyEmail author


We analyze the origin of de-enhancement for a number of vibrational modes in the 21 A g excited state oftrans-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.


Resonance Raman intensities de-enhancement time-dependent wave-packet analysis trans-azobenzene 




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Copyright information

© the Indian Academy of Sciences 1997

Authors and Affiliations

  1. 1.Department of Inorganic and Physical ChemistryIndian Institute of ScienceBangaloreIndia

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