Collective vibrational spectra of a- and y-glycine studied by terahertz and raman spectroscopy

Yulei Shi; Wei Liu; Qing-li Zhou; Cunlin Zhang

doi:10.1117/12.899430

11 August 2011 Collective vibrational spectra of a- and y-glycine studied by terahertz and raman spectroscopy

Yulei Shi, Wei Liu, Qing-li Zhou, Cunlin Zhang

Proceedings Volume 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications; 819505 (2011) https://doi.org/10.1117/12.899430
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

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.

Citation Download Citation

Yulei Shi, Wei Liu, Qing-li Zhou, and 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); https://doi.org/10.1117/12.899430

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