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Theoretical study on the group 2 atoms + N2O reactions

机译:2族原子+ N2O反应的理论研究

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摘要

The electronic structure aspects of the M (S-1,3 P) + N2O(X(1)Sigma(+)) (M = Be, Mg, Ca) reactions are investigated using the CASSCF/MRMP2 (complete active space SCF and the multireference Moller-Plesset perturbation theory of the second order) computational methodology. The lowest adiabatic 1 (1)A(') and 1 3A(') potential energy surfaces (PESs) favor the bending dissociation mechanism of N2O in all studied cases. The rate-limiting channels are determined by the classical barriers that decrease in the series Be (8.9) > Mg (7.0) > Ca (1.2) kcal/mol, whereas the spin-forbidden reaction channels are found to be less important. A comparison with elaborated kinetic results (Plane et al. J. Phys. Chem. 1990, 94, 5255; Gas-Phase Metal Reactions; Elsevier: Amsterdam, 1992; Vinckier et al. J. Phys. Chem. A 1999, 103, 5328) on the Ca (S-1) + N2O(X(1)Sigma(+)) reaction is presented, and the differences in the kinetic behavior of the title reactions are discussed. Our results also indicate that the techniques based on the multiconfigurational wave functions are unavoidable if a correct topology of the PESs governing these reactions is needed.
机译:M(S-1,3 P)+ N2O(X(1)Sigma(+))(M = Be,Mg,Ca)反应的电子结构方面使用CASSCF / MRMP2(完全活性空间SCF和(二阶多参考Moller-Plesset微扰理论)计算方法。在所有研究案例中,最低绝热的1(1)A(')和1 3A(')势能面(PESs)有利于N2O的弯曲解离机理。限速通道由Be(8.9)> Mg(7.0)> Ca(1.2)kcal / mol系列降低的经典势垒确定,而自旋禁止的反应通道则不那么重要。与详细的动力学结果进行比较(Plane等人,J。Phys。Chem。1990,94,5255;气相金属反应; Elsevier:阿姆斯特丹,1992; Vinckier等人,J。Phys。Chem。A 1999,103, 5328)上的Ca(S-1)+ N2O(X(1)Sigma(+))反应提出了,并讨论了标题反应的动力学行为的差异。我们的结果还表明,如果需要用于控制这些反应的PES的正确拓扑,则基于多配置波函数的技术是不可避免的。

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