机构地区: 华南农业大学理学院应用物理系
出 处: 《中山大学学报(自然科学版)》 2009年第5期47-50,共4页
摘 要: 采用密度泛函(B3LYP)方法,以及6-311++G(2df,2pd)基组优化出了单态HBr2+离子的结构参数、离解能和力常数。在此基础上,利用多体项展式方法导出了HBr2+(Cs,X1A′)离子的分析势能函数,并获得其势能面,正确的再现了HBr2+离子的平衡结构特征及其离解能,并可由势能图观察到Br(2Pu)+HBr+(X2Πi)→HBr2+(X1A′)反应通道上出现一个鞍点,其位置在RBrBr=0.42 nm,RHBr=0.16 nm,∠HBrBr=97.5°,V=-5.5 eV,垒高约0.53 eV。为进一步探讨HBr2+离子的反应动力学过程打下了基础。 With using B3LYP/6 - 311 + + G (2df, 2pd) method, the structure of the single state HBr2+ ion and its dissociation energie, force constants have been calculated. The analytical potential en- ergy function of HBr2+ (Cs, X1A') ion has been derived based on the many-body expansion theory. The structure and energy of HBr2+ can correctly reappear on the potential energy surface. Molecular reaction kinetics of Br(2Pu)+HBr*(X2Пi)→HBr2+(X1A') based on the potential energy function is discussed briefly.