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arXiv physics/0502145physics.chem-ph
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化学反应中的重原子隧穿:H + LiF碰撞研究

Heavy atom tunneling in chemical reactions: study of H + LiF collisions

P. F. Weck, N. Balakrishnan

摘要:

在Aguado等人[J.Chem.Phys.119,10088(2003)]的化学精确的X2 A ' LiHF势能面上,用量子散射方法研究了H+LiF(X1 Sigma+,v=0-2,j=0)-->HF(X1 Sigma+,v',j ')+Li(2S)双分子过程.已进行计算为零的总角动量的平移能量从10-7到10-1 eV。初始状态选择反应的概率和截面的特点是共振起源于亚稳态的H.李和李... F-H van der Waals复形。通过在入口和出口通道阱中进行准束缚态计算,对共振进行了广泛的分配。化学反应性被发现在低温下的振动激发显着增强,虽然反应性似乎远不如非反应性的过程中,由于相对较重的氟原子强烈结合在范德华络合物的低效隧穿有利。

英文摘要:

The H+LiF(X 1Sigma+,v=0-2,j=0)-->HF(X 1Sigma+,v',j')+Li(2S) bimolecular process is investigated by means of quantum scattering calculations on the chemically accurate X 2A' LiHF potential energy surface of Aguado et al. [J. Chem. Phys. 119, 10088 (2003)]. Calculations have been performed for zero total angular momentum for translational energies from 10-7 to 10-1 eV. Initial-state selected reaction probabilities and cross sections are characterized by resonances originating from the decay of metastable states of the H...F-Li and Li...F-H van der Waals complexes. Extensive assignment of the resonances has been carried out by performing quasibound states calculations in the entrance and exit channel wells. Chemical reactivity is found to be significantly enhanced by vibrational excitation at low temperatures, although reactivity appears much less favorable than non-reactive processes due to the inefficient tunneling of the relatively heavy fluorine atom strongly bound in van der Waals complexes.

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