THE INS SPECTROSCOPY OF AMINO-ACIDS - L-LEUCINE

Results of inelastic neutron scattering (INS) study on normal and N-de uterated L-leucine are reported. The INS spectra of L-leucine show add itional bands as compared with optical spectroscopic methods (IR and R aman scattering) in the energy transfer up to 800 cm(-1). Both in norm al and d(3)-L-leucine, extra bands correspond to out-of-plane gamma(N- H ... O) at 522, 510 and 257 cm(-1), and gamma(N-D ... O) at 371 cm(-1 ) hydrogen bond vibrations respectively. Methyl and carboxyl groups vi brations are observed at 215, 232, 257 and 290 cm(-1) and 175, 535, 67 4 and 778 cm(-1) respectively.