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Keywords:

  • L-alanine;
  • low-wavenumber range;
  • Raman spectroscopy;
  • self-trapping;
  • vibrational bands

Abstract

“Anomalous changes” in the temperature- and pressure- dependences of the intensities and wavenumbers of the two low-wavenumber modes in Raman spectra of single-crystals of L-alanine have been interpreted in terms of a change in relative contributions of stretching and deformational components into the intermolecular vibrational bands. The relative contributions of the two components into a lattice vibration result from a change of relative orientations of molecules linked by hydrogen bonds in a three-dimensional network on variations of temperature or pressure.