THE VIBRATIONAL SPECTRA OF L-ALANINE

Abstract

Polarized Raman spectra of single crystals of L-alanine, $[N-D_{3}]$ L-alanine, and [2,3,3,3=$D_{4}$] L-alanine have been obtained. Polarized far infrared spectra ($400-30 cm^{-1}$) of crystalline L-alanine and $[N-D_{3}]$ L-alanine have been investigated, Inelastic neutron scattering studies have been made on polycrystalline samples of L-alanine and $[N-D_{3}]$ L-alanine, including temperature dependence studies of the $NH_{3}$-torsional mode. The assignments of the internal and external modes will be discussed.