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Damped harmonic osc illators are ut ilized to calculate Franck-Condon factors within displaced harmonic oscillator approximat ion.This is practically done by scaling unper turbed Hess ian matr ix that represents loca l modes of force constants for molecule in gaseous phase,and then by diagona liz ing per turbed Hess ian matr ix it results indirect modif icat ion of Huang–Rhys factors which represent nor-mal modes of solute molecule per turbed by solvent environment.