中国物理B ›› 2015, Vol. 24 ›› Issue (7): 73301-073301.doi: 10.1088/1674-1056/24/7/073301
• ATOMIC AND MOLECULAR PHYSICS • 上一篇 下一篇
张寒a, 张朝晖a, 赵小燕a, 张天尧a, 燕芳a, 申江b
Zhang Han (张寒)a, Zhang Zhao-Hui (张朝晖)a, Zhao Xiao-Yan (赵小燕)a, Zhang Tian-Yao (张天尧)a, Yan Fang (燕芳)a, Shen Jiang (申江)b
摘要: The crystal structure of L-glutamine is stabilized by a three-dimensional network of intermolecular hydrogen bonds. We utilize plane-wave density functional theory lattice-dynamics calculations within the generalized-gradient approximation (GGA), Perdew–Burke–Ernzerhof (PBE), PBE for solids (PBEsol), PBE with Wu–Cohen exchange (WC), and dispersion-corrected PBE, to investigate the effect of these intermolecular contacts on the absorption spectra of glutamine in the terahertz frequency range. Among these calculations, the solid-state simulated results obtained using the WC method exhibit a good agreement with the measured absorption spectra, and the absorption features are assigned with the help of WC. This indicates that the vibrational modes of glutamine were related to the combination of intramolecular and intermolecular motions, the intramolecular modes were dominated by rocking or torsion involving functional groups; the intermolecular modes mainly result from the translational motions of individual molecules, and the rocking of the hydrogen-bonded functional groups.
中图分类号: (Vibration-rotation analysis)