【摘要】 根据苏肇冰和于渌提出的聚乙炔中极化子及孤子对的形成理论,本文具体计算了注入电子和电子-空穴对通过多声子跃迁形成电子极化子和孤子对的形成速率.我们计算的特点是严格考虑了多电子跃迁中的非正交性问题. 计算结果表明一个注入电子在不小于 4.7 ×10^-15秒的时间内弛豫形成电子极化子,很接近Schrieffer等人的计算结果.而电子-空穴对在大于 1×10^-15秒的时间内形成孤子对,与有关实验相符. 对光生中性孤子对及带电孤子对的俘获截面的比较表明,生成中性孤子对的跃迁是禁戒的,这与苏、于所讨论的选择定则是一致的.更多还原

【Abstract】 Using the multiphonon transition theory as applied to the problem of soliton pairand polaron generation in polyacetylene by Su and Yu,we have calculated the decayrate of an injected electron into a polaron and an electron-hole pair into a soliton pair.The main distinguishing feature of our calculation is that the nonorthogonality of theelectronic wave functions in the N-electron transition is strictly taken into account. It was shown that the nonradiative decay time of an injected electron into a polaronby lattice relaxation is not less than 4.7×10^-15s.which is comparable with the numericalresult obtained by Schrieffer et al.,and that of an electron-hole pair into a soliton-pairis more than 1×10^-15s, which is in agreement with the experimental results. The calculation of cross section for the soliton-pair photoproduction shows that thetransition for neutral soliton-pair photoproduction is forbidden that is in agreementwith the selection rule discussed by Su and Yu.更多还原