在扩展的London Eyring Polanyi Sato(LEPS)势能面基础上,利用准经典轨践法在碰撞能Ecd=3.67 kcal/mol下研究了Cl+CH4→HCl+CH3和Cl+CD4→DCl+CD3反应,在质心系计算得到四个广义极化微分反应截面((PDDCS)(2π/σ)(dσ00/dωt)、(2π/σ)(dσ20/dωt)、(2π/σ)(dσ22/dωt)、(2π/σ)(dσ21/dωt)和k—k’- j’三矢量相关的极角分布P(φr)、k—j’两矢量相关的P(θr)分布以及用以和丸表示的产物转动角动量的空间分布.计算结果与有关实验反理论结果符合得很好,讨论了氯与甲烷和重氢甲烷反应的立体动力学同位素效应。
The product polarization of the reactions Cl + CH4→HCl + CH3 and Cl + CD4→DCl + CD3 are calculated via the quasiclassical trajectory method based on extended London-Eyring-Polanyi-Sato (LEPS) potential energy surface (PES) at the collision energy of 3.67 kcal/mol (0.16 eV). Four polarization dependent generalized differential cross sections (PDDCSs) (2π/δ) (dδ00/dωt ), (2π/δ) (dδ20/dωt ), (2π/δ) ( dδ22+/dωt ) and (2π/δ)( dδ21-/dωt ) have been presented in the center of mass (CM) frame, respectively. Furthermore, the distribution of dihedral angle p (Фr), the distribution of angle between k and j′, P (θr), and the angular distribution of product rotational vectors in the form of polar plots in θr and Фr have been calculated as well. The calculated results are in good agreement with the experimental and the theoretical results. The isotope effect of the Stereodynamics reactions of chlorine atoms with methane and perdeuterated methane are studied detailedly.