Adiabatic quantum trajectory capture for cold and ultra-cold chemical reactions

Abstract : The Langevin capture model is often used to describe barrierless reactive collisions. At very low temperatures, quantum effects may alter this simple capture image and dramatically affect the reaction probability. In this paper, we use the trajectory-ensemble reformulation of quantum mechanics, as recently proposed by one of the authors (Poirier) to compute adiabatic-channel capture probabilities and cross-sections for the highly exothermic reaction Li + CaH(v = 0, j = 0)!LiH + Ca, at low and ultra-lowtemperatures. Each captured quantum trajectory takes full account of tunneling and quantum reflection along the radial collision coordinate. Our approach is found to be very fast and accurate, down to extremely low temperatures. Moreover, it provides an intuitive and practical procedure for determining the capture distance (i.e., where the capture probability is evaluated), which would otherwise be arbitrary.
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Contributeur : Nicolas Clementin <>
Soumis le : mardi 14 août 2018 - 15:45:04
Dernière modification le : mercredi 15 août 2018 - 01:13:12

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Yohann Scribano, Gerard Parlant, Bill Poirier. Adiabatic quantum trajectory capture for cold and ultra-cold chemical reactions. Journal of Chemical Physics, American Institute of Physics, 2018, 149, pp.021101. 〈10.1063/1.5041091〉. 〈hal-01857250〉



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