[1] . Fattinger, D. Grischkowsky. Point source terahertz optics[J]. Appl. Phys. Lett., 1998, 53: 1480-1482.

[2] M. Walther, B. Fischer, M. Schall et al.. Far-infrared vibrational spectra of all-trans, 9-cis and 13-cis retinal measured by THz time-domain spectroscopy[J]. Chem. Phys. Lett., 2000, 332(3～4): 389～395

[3] . Yamaguchi, F. Miyamaru, K. Yamamoto et al.. Terahertz absorption spectra of L-, D-, and DL-alanine and their application to determination of enantiometric composition[J]. Appl. Phys. Lett., 2005, 86(5): 53903.

[4] . L. Shi, L. Wang. Collective vibrational spectra of α- and γ-glycine studied by terahertz and Raman spectroscopy[J]. J. Phys. D: Appl. Phys., 2005, 38: 3741-3745.

[5] leen Frisch, Michael J. Frisch, Gary W. Trucks. Gaussian 03 user′s reference, 2004

[6] . D. Becke. Density-functional thermochemistry. Ⅲ. The role of exact exchange[J]. Chem. Phys., 1993, 98: 5648-5652.

[7] . Parr. Development of the colle-salvetti correlation-energy formula into a functional of the electron density[J]. Phys. Rev. B, 1988, 37: 785-789.

[8] . D. McLean, G. S. Chandler. Contracted Gaussian basis sets for molecula calculations.I. Second row atoms, Z=11-18[J]. J. Chem. Phys., 1980, 72: 5640-5648.

[9] . Krishnan, J. S. Binkley, R. Seeger et al.. Self-consistent molecular orbital methods.XX. basis set for correlated wave functions[J]. J. Chem. Phys., 1980, 72: 650-654.

[10] . . Terahertz spectroscopic investigations of explosives[J]. Phys. Lett. A, 2006, 359: 728-732.

[11] . C. Shen, P. C. Upadhya, E. H. Linfield et al.. Temperature-dependent low-frequency vibrational spectra of purine and adenine[J]. Appl. Phys. Lett., 2003, 82: 2350-2352.