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.
复制标题
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:
影响因子:
--
通讯作者:
J. Palma
中科院分区:
文献类型:
--
作者:
R. Ellerbrock;U. Manthe;J. Palma
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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