对于实验室合成的反-4,4'-双(N,N-二丁胺基)二苯乙烯分子,实验测量了该分子的单光子和双光子荧光谱,然后从理论上研究了其单光子和双光子吸收特性.研究结果表明,在低能量范围内,分子的单光子吸收主要发生在分子的第一激发态,而分子的双光子吸收主要发生在分子的第二和第四激发态上.该分子在相应系列衍生物中具有最大的双光子吸收截面.分子的相关能对分子的激发态能量影响较大.我们给出了分子基态与电荷转移态的电荷转移过程,并从理论上定性解释了双光子聚合反应的聚合机理.

The one-photon and two-photon fluorescence spectra of E-4,4'-bis(N,N-di-n-butylamino)stilbene synthesized in laboratory are measured and the properties of one-photon and two-photon absorptions are studied theoretically. The results show that in the visible light region, the maximal one-photon absorption strength of the molecule occurs in the first excited state, while the two-photon absorption cross section mainly appears in the second and forth excited states. The molecule has the largest two-photon absorption cross section among its series of studied derivatives. The effect of the electron correlation on the energies of excited states is obvious. The charge-transfer process for the ground and charge-transfer state is displayed, and then the mechanism of photopolymerization is qualitatively discussed.