Simulation of photoelectron spectra of nonlinear triatomic molecules: including mode mixing

Different methods [1-4] have been proposed to calculate multidimensional Franck-Condon integrals. We chose a new closed form expression for the Franck-Condon integrals for overlap between arbitrary multidimensional harmonic oscillators by employing the generating functions method. The calculations lead to deduction of the some general rules whereby an arbitrary multidimensional Franck-Condon integral can be expressed as sums of products of the Hermite polynomials.