  Polarized Fourier-Raman spectra of K, Rb and Tl hydrogen phthalates are
studied at the 1064 nm excitation. The frequencies of internal vibrations in
hydrogen phthalates are assigned to vibrations of orthophenylene and carboxyl
groups. A substitution of K for Rb and Tl gave rise to a small low-frequency
shift of vibrations. It is observed the multiband structure of the stretching
OH-vibrations due to the fermi-resonance interactions. A number of additional
bands are found in the spectra of deuterium potassium acid phthalate. It is
suggested that only the partial substitution of hydrogen atoms for deuterium
takes place in both orthophenylene and carboxyl groups.
