H+H2体系的态(R)-态(TS)-态(P)理论研究

H+H₂体系的辛准经典轨迹(SQCT)计算表明: 碰撞轨迹分为A, B两种类型, A型是经过过渡态鞍点的, B型是不经过过渡态鞍点的. A型轨迹不全发生反应, B型轨迹却也可发生反应. A, B两种类型轨迹的配分及其反应性, 与反应物初始态(R)有关. 这种轨迹类型A, B影响着产物态(P)(即振转态)分布及其角度分布. 初步建立了化学反应态(R)-态(TS)-态(P)理论研究的雏形, 深化了对Eyring过渡态理论的理解.     

大气中HCO^+→COH^+异构化的理论分析

在从头算的基础上, 对标题反应进行了统计热力学和含Wigner校正的过渡态理论的动力学分析。给出了1.01325×10^5Pa及200-2500K温度下的反应物、产物和过渡态的热力学函数及该异构化的平衡常数、速率常数和A因子等一套较完整的热力学、动力学参数。     

大气中HSO-3异构体的“量子化学后”研究

在量子化学计算的基础上，用统计热力学方法，计算了亚硫酸氢根离子的两种异构体HOSO^-₂(C_S)和HSO^-₃(C₃V)的热力学性质及它们相互转化的平衡常数(相对稳定性随温度的变化)等。通过计算数据的回归分析，给出了摩尔熵、摩尔热容等随温度变化的表达式。     

Cl+CH4反应的电子相关、基组与化学反应性

Using the results of quantum chemistry, thermodynamic and kinetic calculations for this experimentally well studied reaction has been carried out. The adaptability of the computational results of diffrent quantum chemistry schemes (considering electronic correlation or not, and basis size) has been analyzed for the chemical reactivities (thermodynamic functions and kinetic parameters). The calculated results are in good agreement with the experimental ones using the larger basis set and considering electronic correlation, but are bad on the contrary. In addition, a set of exact thermodynamic functions and kinetic parameters has been given.     

State(R)-state(TS)-state(P) theoretical study of H+H_2 system

The calculation of H + H2 system by symplectic quasiclassical trajectory (SQCT) shows that there are two types of collision trajectories A and B, i.e., type A trajectory passes the saddle point of transition state (TS), whereas type B trajectory does not pass the saddle point of transition state. Not all the reactants of type A trajectory are reactive, while not all of type B trajectory are nonreactive. The partition and reactivity of these two types of trajectories are affected by reactant state(R), furthermore, the types of trajectories affect the state and angle distributions of products. Not only the rudiment framework for theoretical study on state(R)-state(TS)-state(P) is established, but also the further understanding of transition state theory (TST) of Eyring is investigated in this paper.