Impulsive pump-probe and photon-echo spectroscopies of dye molecules in condensed phases

Abstract
A theory for impulsive resonant pump-probe and photon-echo spectroscopies of polyatomic dyes in solution is developed. A multimode calculation in which the intramolecular and solvation modes are modeled as Brownian oscillators is presented. Electronic dephasing, the time-dependent Stokes shift, and quantum beats are analyzed.