11 August 2011 Collective vibrational spectra of a- and y-glycine studied by terahertz and raman spectroscopy
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Terahertz time-domain spectroscopy (THz-TDS) is used to investigate the absorption and dispersion of polycrystalline α - and γ -glycine in the spectral region 0.5-3.0 THz. The spectra exhibit distinct features in these two crystalline phases. The observed far-infrared responses are attributed to intermolecular vibrational modes mediated by hydrogen bonds. We also measure the Raman spectra of the polycrystalline and dissolved glycine in the frequency range 28-3900 cm-1. The results show that all the vibrational modes below 200 cm-1 are nonlocalized but are of a collective (phonon-like) nature. Furthermore, the temperature dependence of the Raman spectra of α -glycine agrees with the anharmonicity mechanism of the vibrational potentials.
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Yulei Shi, Yulei Shi, Wei Liu, Wei Liu, Qing-li Zhou, Qing-li Zhou, Cunlin Zhang, Cunlin Zhang, } "Collective vibrational spectra of a- and y-glycine studied by terahertz and raman spectroscopy", Proc. SPIE 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications, 819505 (11 August 2011); doi: 10.1117/12.899430; https://doi.org/10.1117/12.899430

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