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Proceedings Paper

Collective vibrational spectra of a- and y-glycine studied by terahertz and raman spectroscopy
Author(s): Yulei Shi; Wei Liu; Qing-li Zhou; Cunlin Zhang
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Paper 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.

Paper Details

Date Published: 12 August 2011
PDF: 17 pages
Proc. SPIE 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications, 819505 (12 August 2011); doi: 10.1117/12.899430
Show Author Affiliations
Yulei Shi, Capital Normal Univ. (China)
Wei Liu, Capital Normal Univ. (China)
Qing-li Zhou, Capital Normal Univ. (China)
Cunlin Zhang, Capital Normal Univ. (China)


Published in SPIE Proceedings Vol. 8195:
International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications
X.-C. Zhang; Jianquan Yao; Cunlin Zhang; Zhenzhan Wang, Editor(s)

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