UNIFORM SEMICLASSICAL EXPANSIONS FOR THE DIRECT PART OF FRANCK-CONDONTRANSITIONS

Semiclassical expansions for traces involving Green's functions receiv e 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 le ngth with an emphasis on the application to Franck-Condon transitions. The expansion in the energy representation is asymptotic and a critic al parameter is identified. In the time domain, a series expansion of the logarithm of the propagator gives very good results. The expansion s are illustrated for transitions onto a linear potential and onto a h armonic oscillator. [S1050-2947(98)09402-5].