Collective Vibrational Spectra of α- and γ-Glycine Studied by Terahertz and Raman Spectroscopy

被引：2

作者：

Shi, Yulei ^{[1
]}

Liu, Wei ^{[1
]}

Zhou, Qing-li ^{[1
]}

Zhang, Cunlin ^{[1
]}

机构：

[1] Capital Normal Univ, Dept Phys, Beijing Key Lab Terahertz Spect & Imaging, Key Lab Terahertz Optoelect,Minist Educ, Beijing 100048, Peoples R China

来源：

INTERNATIONAL SYMPOSIUM ON PHOTOELECTRONIC DETECTION AND IMAGING 2011: TERAHERTZ WAVE TECHNOLOGIES AND APPLICATIONS | 2011年 / 8195卷

关键词：

THz time-domain spectroscopy; Raman spectroscopy; Collective vibration; Hydrogen bond; glycine; TIME-DOMAIN SPECTROSCOPY; LOW-FREQUENCY VIBRATIONS; ALL-TRANS; MODES; DNA;

D O I：

10.1117/12.899430

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Terahertz time-domain spectroscopy (THz-TDS) 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 alpha-glycine agrees with the anharmonicity mechanism of the vibrational potentials.

引用

页数：17

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