Uniform semiclassical expansions for the direct part of Franck-Condon transitions

Details Uniform semiclassical expansions for the direct part of Franck-Condon transitions Uniform semiclassical expansions for the direct part of Franck-Condon transitions

1997-10-13

arxiv.org/abs/chao-dyn/9710007v1

Nonlinear Sciences

Chaotic Dynamics

11 pages, Revtex, 7 figures, Encapsulated Postscript, submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.57.1536

Semiclassical expansions for traces involving Greens functions have two contributions, one from the periodic or recurrent orbits of the classical system and one from the phase space volume, i.e. the paths of infinitesimal length. Quantitative calculations require the control of both terms. Here, we discuss the contribution from paths of zero length with an emphasis on the application to Franck-Condon transitions. The expansion in the energy representation is asymptotic and a critical parameter is identified. In the time domain, a series expansion of the logarithm of the propagator gives very good results. The expansions are illustrated for transitions onto a linear potential and onto a harmonic oscillator.

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