title: Quantum dynamics study of the K+HF(v=0-2,j=0)-->KF+H reaction and comparison with quasiclassical trajectory results.
abstract: Extensive quantum real wave packet calculations within the helicity decoupling approximation are used to analyze the influence of the HF vibrational excitation on the K+HF(v=0-2,j=0)-->KF+H reaction. Quantum reaction probabilities P and reaction cross sections sigma are compared with corresponding quasiclassical trajectory (QCT) results. Disregarding threshold regions for v=0 and 1 (v=2 has no threshold), both approaches lead to remarkably similar results, particularly for sigma, validating the use of the QCT method for this system. When moving from v=0 to v=1 there is a large increase in P and sigma, as expected for a late barrier system. For v=2 the reaction becomes exoergic and P approximately 0.95 (with the exception of large total angular momenta where centrifugal barriers play a role). While substantial vibrational enhancement of the reactivity is thus seen, it is still quite less than that inferred from experimental data in the intermediate and high collision energy ranges. The origin of this discrepancy is unclear.
authors.affiliation: Departament de Química Física i Centre de Recerca en Química Teórica, Universitat de Barcelona i Parc Científic de Barcelona, C/ Martí i Franquès, 1, 08028 Barcelona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Mayneris
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Martínez
authors.forename: Jordi
authors.initials: J
authors.lastname: Hernando
authors.forename: Stephen K
authors.initials: SK
authors.lastname: Gray
authors.forename: Miguel
authors.initials: M
authors.lastname: González