The cross-section is the product of the Franck-Condon overlap envelope (F(E)) and the transition moments(T(E)). The Franck-Condon envelope was obtained by the summation and normalization of the Franck-Condon factors computed by the Linear Coupling Model (LCM). The Lorentzian function was used for the line shape broadening of the calculated Franck-Condon transitions. The transition moments were computed within the frozen-core Hartree-Fock approximation, by solving the staticexchange continuum equations with the single-center expansion technique.