  A method for study of charge-transfer interactions between solute molecules
and solvent based on the comparison of the ratios of spectral shifts of
different electronic transitions in solute molecules in chemically inert
solvent is proposed. The method is applicable to molecules that do not change
their dipole moment on excitation. As an example, a presence of charge transfer
interactions in higher electronic states of aromatic hydrocarbons (benzene,
phenanthrene, and naphthalene) dissolved in water and alcohols was
demonstrated.
