کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5189220 | 1381179 | 2006 | 6 صفحه PDF | دانلود رایگان |
In this paper, we employ the sum-over-states formula to calculate the dynamic third-order nonlinear optical polarizabilities of three optical processes, third-harmonic generation, electric-field-induced second-harmonic generation, and degenerate four-wave mixing, at the ground state of aniline oligomers. The ground state configurations of these compounds are obtained by the geometrical optimizations based on the B3LYP/6-31G** level. The transition moment elements and the transition energies are obtained by using the time-dependent density functional theory at the B3LYP/6-31G* level. The calculated results show that the third-order polarizability ãγã at the ground singlet state is increasing with the increase of repeat units number N of aniline oligomers and it approaches saturation at chain length around N=7-8.
Journal: Polymer - Volume 47, Issue 5, 22 February 2006, Pages 1749-1754