Temperature-dependent low-frequency vibrational spectra of purine and adenine

被引:198
作者
Shen, YC
Upadhya, PC
Linfield, EH
Davies, AG
机构
[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
[2] Univ Leeds, Sch Elect & Elect Engn, Leeds LS2 9JT, W Yorkshire, England
关键词
D O I
10.1063/1.1565680
中图分类号
O59 [应用物理学];
学科分类号
摘要
Terahertz time-domain spectroscopy has been used to measure the vibrational spectra of polycrystalline purine and adenine over the temperature range 4-290 K. A number of well-resolved absorption peaks were observed in the frequency range 0.2-3.0 THz, which are interpreted as originating from intermolecular vibrational modes mediated by hydrogen bonds. We find that as the temperature is reduced, the observed absorption bands resolve into narrower peaks and some shift towards higher frequencies. We explain the temperature dependence of the spectra by the anharmonicity of the vibrational potentials and give an empirical expression to describe the frequency shift. (C) 2003 American Institute of Physics.
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页码:2350 / 2352
页数:3
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