高分子中的电子-声子相互作用与非线性光学极化率  

ELECTRON-PHONON INTERACTION AND NONLINEAR OPTICAL SUSCEPTIBILITY OF POLYMER

作　　者：傅荣堂[1] 李列明[1] 孙鑫[1] 傅柔励[2] 

机构地区：[1]复旦大学物理系 [2]中国科学院上海技术物理研究所,红外物理国家实验室,上海200083

出　　处：《物理学报》1993年第3期422-430,共9页Acta Physica Sinica

基　　金：国家新材料委员会;国家自然科学基金

摘　　要：反式聚乙炔的三次谐波产生谱(THG)在0.6和0.9eV处有两个共振峰。现有的各种理论都不能满意地解释第二个共振峰。只有正确地得到激发态的阻尼才能确定第二个峰。本文计算了高分子中电子-声子相互作用所引起的激发阻尼,它随激发态而变化。根据此种激发阻尼求得的三次谐波产生谱,其理论计算与实验数据很好地符合。The third harmonic generation spectrum (THG) of trans-polyacetylene exhibits two peaks at 0.6eV and 0.9 eV respectively. None of the existing theories can give a quantitatively satis-factory interpretation. By considering properly the excitation-dependent damping, we can get the second peak at 0.9eV. The damping of excited states that we depict in this paper due to electron-phonon interaction of polymer varies with the excited states. According to this dam-ping, the theoretical results of THG agree with the observed spectrum very well.

关 键 词：高聚物 电子-声子 相互作用 阻尼 

分 类 号：O631.24[理学—高分子化学]