[1] Gustavsson T, Lazzarotto E, Markovitsi D. Singlet excitedstate behavior of uracil and thymine in aqueous solution: a combined experimental and computational study of 11 uracil derivatives[J]. J Am Chem Soc, 2006, 128(34): 607-619.
[4] Massey A, Xu Y Z. Photoactivation of DNA thiobases as a potential novel therapeutic option[J]. Current Biology, 2001, 11(14): 1142-1146.
[5] Shukla M K, Leszczynski J. Multiconfigurational selfconsistent field study of the excited state properties of 4thiouracil in the gas phase[J]. J Phys Chem A, 2004, 108(35): 7241-7246.
[6] Pownall H J, Schaffer A M. The electronic spectroscopy of pyrimidines: the effect of covalently bonded sulfur on the phosphorescence and absorption spectra[J]. J Photochem Photobiol, 1978, 27(24): 625-628.
[7] Capitanio D A, Pownall H J, Huber J R. Spectroscopic and photochemical properties of aromatic thioketones: Xanthione[J]. J Photochem, 1974, 3(34): 225-236.
[8] Becke A D. Density functional calculations of molecular bond energies[J]. J Chem Phys, 1986, 84(8): 4524-4529.
[9] Lee C, Yang W, Parr R G. Development of the ColleSalvetti correlationenergy formula into a functional of the electron density[J]. Phys Rev B, 1988, 37(2): 785-789.
[10] Foresman J B, Frisch M J. GAUSSIAN 03[M]. Pittsburgh PA: Gaussian Inc, 2003.