
Abstract Infrared absorption spectra of the α-form crystals of glycine (NH3+CH2COO−), glycine-d3 (ND3+CH2COO−), glycine-d2 (NH3+CD2COO−) and glycine-d5 (ND3+CD2COO−) have been observed in the spectral region of 4000–280 cm−1. A normal co-ordinate treatment has been made of each of these four molecules as a seven-body system. Based upon the results of these observations and treatment, discussions are given on the normal vibrations of glycine molecules.
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