The extent of non-Born-Oppenheimer coupling in the reaction of Cl(2P) with para-H2 |
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Authors: | Wang Xingan Dong Wenrui Xiao Chunlei Che Li Ren Zefeng Dai Dongxu Wang Xiuyan Casavecchia Piergiorgio Yang Xueming Jiang Bin Xie Daiqian Sun Zhigang Lee Soo-Y Zhang Dong H Werner Hans-Joachim Alexander Millard H |
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Affiliation: | State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, People's Republic of China. |
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Abstract: | Elementary triatomic reactions offer a compelling test of our understanding of the extent of electron-nuclear coupling in chemical reactions, which is neglected in the widely applied Born-Oppenheimer (BO) approximation. The BO approximation predicts that in reactions between chlorine (Cl) atoms and molecular hydrogen, the excited spin-orbit state (Cl*) should not participate to a notable extent. We report molecular beam experiments, based on hydrogen-atom Rydberg tagging detection, that reveal only a minor role of Cl*. These results are in excellent agreement with fully quantum-reactive scattering calculations based on two sets of ab initio potential energy surfaces. This study resolves a previous disagreement between theory and experiment and confirms our ability to simulate accurately chemical reactions on multiple potential energy surfaces. |
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