Abstract
Polarized vibrational spectra of a Bet.H 3AsO 4 single crystal at room temperature (ferroelastic phase) have been measured. The results have been discussed in relation to crystal structure. Absorption due to the antisymmetric stretching vibration (νOH) of the O(4) ⋯ O(4) hydrogen bond which is parallel to the axis of spontaneous polarization has been identified in the infrared spectrum polarized ∥ c axis. The internal vibrations of both the AsO −3 4 ion and the betaine molecule have been discussed, and assignments of the bands arising from them have been proposed.
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