Abstract
Using an optically thin single crystal sample, mounted in a cryostat permitting cooling to 6 K, and a synchrotron as a bright light source, exceptionally well defined absorption spectra of well-characterised α-glycine have been obtained in the spectral range 2.5–7.5 THz (approximately 80–240 cm−1). Four separate resonances have been observed, respectively at 93, 152, 188, and 223 cm−1 at the lowest temperature. Each reduces in frequency (redshifts) as temperature increases. The origin of this observed behaviour is attributed to a phonon-mediated anharmonicity in the crystal potential.
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More From: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
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