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High-quality, temperature-dependent terahertz spectroscopy of single crystalline L-alanine: Experiment and density-functional theory

Journal Article


Abstract


  • For the first time, the terahertz transmittance spectra of l-alanine have been measured using a single crystal. Measurements were obtained over a large temperature range (12-300 K) and revealed 18 absorptions between 20 and 250 cm-1. These modes were sharp and symmetric, a feature of single crystals and low temperatures. The spectra were directly compared to those of a powdered pellet sample. Raman spectroscopy and x-ray diffraction were used to confirm the sample's structure and purity. With increasing temperature, all modes exhibit spectral redshift, well described by a Bose-Einstein model, indicating the phonon origin of the absorptions. The exceptions are the 91 and 128 cm-1 modes. The former blueshifts. The latter initially blueshifts but transitions to redshifting. Both behaviors are anomalous. Density-functional theory modeling helped assign all the observed modes.

UOW Authors


Publication Date


  • 2021

Citation


  • Sanders, T. J., Allen, J. L., Horvat, J., & Lewis, R. A. (2021). High-quality, temperature-dependent terahertz spectroscopy of single crystalline L-alanine: Experiment and density-functional theory. The Journal of chemical physics, 154(24), 244311. doi:10.1063/5.0054063

Scopus Eid


  • 2-s2.0-85112123631

Start Page


  • 244311

Volume


  • 154

Issue


  • 24

Abstract


  • For the first time, the terahertz transmittance spectra of l-alanine have been measured using a single crystal. Measurements were obtained over a large temperature range (12-300 K) and revealed 18 absorptions between 20 and 250 cm-1. These modes were sharp and symmetric, a feature of single crystals and low temperatures. The spectra were directly compared to those of a powdered pellet sample. Raman spectroscopy and x-ray diffraction were used to confirm the sample's structure and purity. With increasing temperature, all modes exhibit spectral redshift, well described by a Bose-Einstein model, indicating the phonon origin of the absorptions. The exceptions are the 91 and 128 cm-1 modes. The former blueshifts. The latter initially blueshifts but transitions to redshifting. Both behaviors are anomalous. Density-functional theory modeling helped assign all the observed modes.

UOW Authors


Publication Date


  • 2021

Citation


  • Sanders, T. J., Allen, J. L., Horvat, J., & Lewis, R. A. (2021). High-quality, temperature-dependent terahertz spectroscopy of single crystalline L-alanine: Experiment and density-functional theory. The Journal of chemical physics, 154(24), 244311. doi:10.1063/5.0054063

Scopus Eid


  • 2-s2.0-85112123631

Start Page


  • 244311

Volume


  • 154

Issue


  • 24