Abstract
The inelastic interaction between the incident photons and acoustic phonons in the taurine single crystal was investigated by using Brillouin spectroscopy. Three acoustic phonons propagating along the crystallographic b-axis were investigated over a temperature range of −185 to 175 °C. The temperature dependences of the sound velocity, the acoustic absorption coefficient, and the elastic constants were determined for the first time. The elastic behaviors could be explained based on normal lattice anharmonicity. No evidence for the structural phase transition was observed, consistent with previous structural studies. The birefringence in the ac-plane indirectly estimated from the split longitudinal acoustic modes was consistent with one theoretical calculation by using the extrapolation of the measured dielectric functions in the infrared range.
Highlights
Taurine (2-aminoethanesulfonic acid), NH3(CH2)2SO3, is a well-known and important organic compound that is found in many organs of animal bodies, the bile being the most representative one [1]
There are trans and gauche forms in taurine molecules, but the taurine crystal is grown in the zwitterion configuration (NH3+–CH2–CH2–SO3−) where only the gauche configuration exists, as confirmed by x-ray crystallography [8,9,10,11,12]
Each Brillouin spectrum consists of one longitudinal acoustic (LA) mode at ~24 G3H
Summary
Taurine (2-aminoethanesulfonic acid), NH3(CH2)2SO3, is a well-known and important organic compound that is found in many organs of animal bodies, the bile being the most representative one [1]. Taurine can be formed into a colorless crystal and can be studied as one of the organic crystals. There are trans and gauche forms in taurine molecules, but the taurine crystal is grown in the zwitterion configuration (NH3+–CH2–CH2–SO3−) where only the gauche configuration exists, as confirmed by x-ray crystallography [8,9,10,11,12]. According to these structural studies, the N—H···O hydrogen bonds form a three-dimensional network, and the electrostatic potential exhibits large negative and positive regions near SO3− and NH3+, respectively
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