Polarized infrared spectra of pentasodium trihydrogen tetraselenate dihy-drate, Na(5)H(3)(SeO4)(4)2H(2)O, are analysed using a model which takes account of the Fermi resonance interactions between the OH stretching vibrations and various combination tones. It is demonstrated that the short, centrosymmetric, hydrogen bond of the hydro-gendisefenate anion generates an intense broad absorption whose spectral features can be described taking into consideration strong interaction between the va (OHO) stretching vibration and lattice phonons, while the longer hydrogen bond linking hydrogenselenate ions to the hydrogendiselenate anion gives a typical ABC band structure.
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