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在HF水平上,利用解析响应函数方法,研究了1,4_二甲氧基_2,5_二乙烯基苯系列衍生物分子的单光子和双光子吸收特性.实验测量了反,反_2,5_双(4′_N,N_二丁胺基苯乙烯)_1,4_二甲氧基苯分子的单光子和双光子荧光谱.研究结果表明该系列分子具有较强的双光子吸收特性.在低能量范围内,对于D_πA型分子,分子的单光子吸收强度和双光子吸收截面最大值都发生在分子的第一激发态.对于D_π_D型分子,单光子吸收强度最大值出现在分子的第一激发态,而最大双光子吸收值则对应于分子的第二激发态.分子的单和双光子吸收强度和分子官能团的电性有关.对于由该类π中心部分构成的分子,其对称型不一定比不对称型更有利于提高双光子吸收截面.分子基态与电荷转移态的电荷转移过程定性地解释了双光子聚合反应的聚合机理.
At the level of HF, the single-photon and two-photon absorption of 1, 4-dimethoxy-2,5-divinylbenzene derivatives were studied by analytical response function method. 2,5_ bis (4’_N, N_-dibutylamino-styrene) _1,4_ dimethoxybenzene molecule single-photon and two-photon fluorescence spectroscopy results show that the series of molecules with strong two-photon In the low energy range, the single-photon absorption intensity and the maximum two-photon absorption cross-section of the molecules occur in the first excited state of the molecule for the molecule of type D_πA.For the D_π_D-type molecule, the maximum single photon absorption intensity appears at Molecular first excited state, while the maximum two-photon absorption corresponds to the second excited state of the molecule.The single and two-photon absorption intensity of the molecule is related to the electrical properties of the molecular functional group.In the case of the molecule consisting of the central part of π, The symmetry type is not necessarily better than the asymmetric type to improve the two-photon absorption cross section. The charge transfer process of the ground state and the charge transfer state qualitatively explains the polymerization mechanism of two-photon polymerization.