溶剂化变色法测定有机分子β的若干问题

溶剂化变色法是测定有机分子超极化率．的一种半定量方法,已为许多实验室采用并取得了较好的结果．它的理论依据是描述有机分子产值的双能级模型【小式中：P。、11。分别为分子的基态和激发态偶极矩,。e。和11e。则分别为基态和激发态的跃迁频率和跃迁偶极矩．这包括三个方面

Problems in Measurement of Organic Molecular β by the Solvatochromism

In This paper some problems, which should be noticed in the measurements of organic molecular first hyperpolarizability（β） by the solvatochromism , are discussed based on the results of the measurements for 11 compounds .The experiments indicate the at the selection of solvent used is the basis of the method to fit for use. The determination of the parameter a, which is the radius of a spherical cavity occupied by the molecules in the solutions, is the key to decide the reasonableness of the obtained results and the formula for a=1/2(l'+rv),has been suggested in which l is the molecular length of the nonlinear optical active part and can be obtained from values of bond lengths in literature, rv is the average spherical radius of used solvents.