Theory of charge-transfer spectra in frozen media

Absorption and fluorescence maxima of charge-transfer spectra in frozen media are treated, noting that only some of the motions for liquid medium are frozen in corresponding solid or glassy phase. Account is taken of the fact that the under which the static dielectric constant of the frozen phase is measured do not usually correspond to those in the initial state of the solute system is prepared. Expressions for the maxima are obtained in terms of the optical static dielectric constants of the liquid and frozen (solid or glassy) phases. Comparison of Stokes shifts hv_a-hv_f at conventional times in frozen media with Stokes shifts at picosecond or subpicosecond times in liquid media would be of interest.