A Quasi-Classical Evaluation of the J-Shifting Approximation for the Reactive Cross Sections of F + CHD3 and F + CH4.

A Quasi-Classical Evaluation of the J-Shifting Approximation for the Reactive Cross Sections of F + CHD3 and F + CH4.
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F CHD3 和 F CH4 电抗截面 J 平移近似的准经典评估

DOI:
10.1021/acs.jpca.9b06060
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发表时间:
2019
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
J. Palma
J. Palma
中科院分区:
--
文献类型:
--
作者:
R. Ellerbrock;U. Manthe;J. Palma

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本文对F+ CH 4 → HF+ CH 3和F+ CH D 3 → HF+ CD 3/DF+ CH D 2反应的J-位移近似进行了计算。特别地,我们分析了甲烷的转动状态如何影响近似的质量。系统被认为是在全维。由于全量子散射计算仍然是不可行的,这些反应,我们采用准经典轨迹(QCT)计算的截面。这些反应的Born-Oppenheimer势能面的特征对J位移方法的假设提出了很大的挑战。尽管如此,我们发现,如果甲烷分子处于转动基态,它对这两个反应都有很好的表现。然而,当甲烷被旋转激发时,该方法为F+ CH 4系统提供了良好的结果,但显然对F+ CHD 3失败。这种失败的原因将进行讨论,并将介绍一个简单的程序,以恢复良好的估计的横截面从J = 0的计算。
We evaluated the accuracy of theJ-shifting approximation to estimate reactant state-selected cross sections for the F+CH4→ HF+CH3and F+CHD3→ HF+CD3/DF+CHD2reactions. In particular, we analyzed how the rotational state of methane influences the quality of the approximation. The systems were considered in full dimensionality. Since full-quantum scattering calculations are still unfeasible for these reactions, we employed quasi-classical trajectories (QCT) to calculate the cross sections. The characteristics of the Born–Oppenheimer potential energy surface of these reactions pose a great challenge to the assumptions of theJ-shifting approach. In spite of this, we found that it performs well for both reactions if the methane molecule is in the rotational ground state. However, when methane is rotationally excited, the approach affords good results for the F+CH4system but clearly fails for F+CHD3. The reasons for this failure will be discussed, and a simple procedure to recover good estimators for the cross sections fromJ= 0 calculations will be introduced.
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