采用线性组合算符和变分方法研究了极性晶体膜中激子与表面光学(SO)声子强耦合、与体纵光学(LO)声子弱耦合体系的性质,推导出了激子诱生势的表达式,并以AgBr晶体为例进行了数值计算.结果表明:激子的诱生势不仅与电子-空穴间距离有关,而且温度与极性晶体膜厚度对激子诱生势的影响也十分显著. The linear combinatorial operators and variational methods are used to study the properties of the strong coupling between exciton and surface optical (SO) phonons and the weak coupling with bulk longitudinal optical (LO) phonons in polar crystalline films. The exciton induced The results show that the induced potential of excitons is not only related to the distance between the electron and the hole, but also the effect of the temperature and the thickness of the polar crystal film on the exciton induced potential The impact is also significant.