Interpretation of THz Intensities of Molecular Crystals: the Role of Mixing between Intermolecular and Intramolecular Vibrations

被引：0
|
作者：
Zhang, F. [1 ]
Wang, H-W [2 ]
Tominaga, K. [1 ]
Hayashi, M. [2 ]
Tani, Masahiko [3 ]
机构：
[1] Kobe Univ, Mol Photosci Res Ctr, Nada Ku, Kobe, Hyogo 6570013, Japan
[2] Natl Taiwan Univ, Ctr Condensed Matter Sci, 1 Roosevelt Rd,Sec 4, Taipei 10617, Taiwan
[3] Univ Fukui, Res Ctr Dev Far Infrared Reg, Fukui 9108507, Japan
来源：
INFRARED, MILLIMETER-WAVE, AND TERAHERTZ TECHNOLOGIES VII | 2020年 / 11559卷
关键词：
THz spectroscopy; IR intensity; selection rule; transition moment; intermolecular vibration; intramolecular vibration; TERAHERTZ TIME-DOMAIN; L-ALANINE; SPECTROSCOPY; MODES; SOLIDS;
D O I：
10.1117/12.2575351
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Through a quantitative discussion of THz modes in the racemic and enantiomeric crystals of alanine, we have examined the restriction on the THz selection rule imposed by the space-group symmetries. We have also revealed an essential role played by intramolecular vibrations in determining the IR intensities of THz modes in the low-frequency region. Although the intramolecular vibrations make marginal contributions to the vibrational energies of the low-frequency modes, they are crucial to the generation of transition moments.
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页数：4
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