Collective vibrational spectra of α- and γ-glycine studied by terahertz and Raman spectroscopy

被引:77
作者
Shi, YL [1 ]
Wang, L [1 ]
机构
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100080, Peoples R China
关键词
D O I
10.1088/0022-3727/38/19/024
中图分类号
O59 [应用物理学];
学科分类号
摘要
Terahertz time-domain spectroscopy is used to investigate the absorption and dispersion of polycrystalline alpha- and gamma-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 cl-glycine agrees with the anharmonicity mechanism of the vibrational potentials.
引用
收藏
页码:3741 / 3745
页数:5
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