【作者】 许燕；

【导师】 孟庆田；

【作者基本信息】 山东师范大学 ， 原子与分子物理， 2010， 硕士

【摘要】 在过去的几十年里,分子反应动力学研究已经取得了很大进展,并已经深入到态-态反应过程。对原子分子碰撞反应,实验和理论研究以前总是主要关注反应的一些标量性质。近年来,随着实验技术的迅速发展,化学反应的矢量性质,比如速度和角动量等,引起了人们广泛的兴趣。因为只有把标量性质和矢量性质综合起来考虑,才能呈现完整的动力学信息。准经典轨线(QCT)计算就是研究原子与分子碰撞的立体反应动力学的一种有效方法。本文主要基于Persky等构造的最新的London-Eyring-Polanyi-Sato(LEPS)势能面,采用QCT方法研究了H+BrF→HBr+F反应。计算了反映矢量相关的角分布和在光诱导的双分子反应实验中比较敏感的四个极化微分截面。结果表明:随着碰撞能的增加,产物的转动极化变强,并且产物分子的后向散射占主导地位。通过比较反应D+BrF→DBr+F和H+BrF→HBr+F的产物极化,揭示了明显的同位素效应。本文也采用相同的方法研究了反应物的振动态对O(1D)+HF→F(1P) +OH反应的影响,发现产物分子主要表现为后向散射。由于反应物振动态的不同,极化微分截面(PDDCSs)呈现不同的特点。论文共分为五章。第一章为简要地介绍了分子反应动力学及立体动力学的发展和研究现状,第二章介绍了QCT的原理、计算方法以及势能面的知识。第三章对H+BrF→HBr+F反应的理论研究结果进行了分析和讨论,揭示了碰撞能和同位素对立体反应动力学的影响。第四章介绍了反应物的振动态对O(1D)+HF→F(1P) +OH反应的影响,并做了讨论。第五章是结束语,对本论文的所有内容进行了总结。更多还原

【Abstract】 During the past decades, molecular reaction dynamics has made great progress and has gotten into a new stage of the state-to-state chemical dynamics. Formerly, the theoretical and experimental study of the atomic and molecular collision reaction always focused on some scalar properties. With the rapid development of experimental techniques, however, the interest in vector properties of chemical reactions, such as velocities and angular momentum, has increased significantly in recent decades. Only by understanding the scalar and vector properties together, can we obtain the fullest picture of the scattering dynamics. Quasiclassical Trajectory Calculation (QCT) is one of the effective methods for investigating atomic and molecular collision reaction stereodynamics.QCT calculations are carried out for the exothermic reaction H+BrF→HBr+F on the latest London-Eyring-Polanyi-Sato (LEPS) potential energy surface. The product angular distributions which reflect the vector correlation are calculated; Polarization dependent differential cross sections which are sensitive to many photoinitiated bimolecular reaction experiments are presented in the center of mass frame. The calculated results suggest that the poduct rotational polarization becomes stronger as collision energy increases and products were mainly backward scattering. By comparing the poduct polarization of reactions D+BrF→DBr+F and H+BrF→HBr+F, the isotope effects have also been revealed. Using the same mothod, we study the stereodynamics of the reaction O(1D)+HF→F(1P) +OH, and analyze the influence of the reagent vibration on the stereodynamics of this reaction. The results indicate that the OH product mainly tends to the forward scattering, and polarization dependent differential cross sections (PDDCSs) are also influenced by the vibration levels of HF. The paper can be divides into five chapters. The outline of the molecular reaction dynamics and stereodynamics is presented in the introduction. The QCT principle, the computational method, and the knowledge of potential energy surface is given in the second chapter. The QCT results of the reaction H+BrF→HBr+F are presented in the third section. The paper also calculates the effect of the reagent vibration on stereodynamics of the reaction O(1D)+HF→F(1P) +OH, which can be found in the fourth section. The fifth chapter is the conclusion, which makes a summary about content involved the in this article.更多还原