A quantum mechanical and quasi-classical trajectory study of the Cl+H₂ reaction and its isotopic variants: Dependence of the integral cross section on the collision energy and reagent rotation
Quantum mechanical (QM) and quasi-classical trajectory (QCT)
calculations have been performed for the Cl+H-2, Cl+D-2, Cl+HD –>
HCl(DCl)+D(H) reactions in order to determine integral cross sections as
a function of collision energy and for different reagent rotational
quantum numbers using the recent ab initio BW2 potential energy surface
(PES) by Bian and Werner [J. Chem. Phys. 112, 220 (2000)]. The results
are compared with experimental data obtained by using the
Doppler-selected time-of-flight technique. It has been found
theoretically by both the QM and QCT methods that reagent rotation
enhances reactivity in agreement with experiment. The QM results are
found to be in quantitative agreement with the experimental excitation
functions for the Cl+p-H-2 and Cl+n-H-2 reactions, whereas those
obtained quasi-classically fail to reproduce the experimental data.
These results are in strong contrast with those reported on the previous
G3 PES, in which QM and QCT calculations predicted that reactivity
decreases with reagent rotation. The intermolecular isotope effect,
i.e., the ratio between the cross sections of the Cl+n-H-2 and Cl+n-D-2
reactions, Gamma (inter)(Cl+n-H-2/Cl+n-D-2), predicted by QM
calculations on the BW2 surface is notably larger than that obtained
experimentally. (C) 2001 American Institute of Physics.
%0 Journal Article
%1 publ9344059
%A Aoiz, F. J.
%A Bañares, L.
%A Castillo, J. F.
%A Menéndez, M.
%A Skouteris, D.
%A Werner, H. J.
%D 2001
%J J. Chem. Phys.
%K chemie imported werner from:alexanderdenzel theoretische stuttgart theochem
%N 5
%P 2074–2081
%R 10.1063/1.1385155
%T A quantum mechanical and quasi-classical trajectory study of the Cl+H₂ reaction and its isotopic variants: Dependence of the integral cross section on the collision energy and reagent rotation
%U http://dx.doi.org/10.1063/1.1385155
%V 115
%X Quantum mechanical (QM) and quasi-classical trajectory (QCT)
calculations have been performed for the Cl+H-2, Cl+D-2, Cl+HD –>
HCl(DCl)+D(H) reactions in order to determine integral cross sections as
a function of collision energy and for different reagent rotational
quantum numbers using the recent ab initio BW2 potential energy surface
(PES) by Bian and Werner [J. Chem. Phys. 112, 220 (2000)]. The results
are compared with experimental data obtained by using the
Doppler-selected time-of-flight technique. It has been found
theoretically by both the QM and QCT methods that reagent rotation
enhances reactivity in agreement with experiment. The QM results are
found to be in quantitative agreement with the experimental excitation
functions for the Cl+p-H-2 and Cl+n-H-2 reactions, whereas those
obtained quasi-classically fail to reproduce the experimental data.
These results are in strong contrast with those reported on the previous
G3 PES, in which QM and QCT calculations predicted that reactivity
decreases with reagent rotation. The intermolecular isotope effect,
i.e., the ratio between the cross sections of the Cl+n-H-2 and Cl+n-D-2
reactions, Gamma (inter)(Cl+n-H-2/Cl+n-D-2), predicted by QM
calculations on the BW2 surface is notably larger than that obtained
experimentally. (C) 2001 American Institute of Physics.
@article{publ9344059,
abstract = {Quantum mechanical (QM) and quasi-classical trajectory (QCT)
calculations have been performed for the Cl+H-2, Cl+D-2, Cl+HD –>
HCl(DCl)+D(H) reactions in order to determine integral cross sections as
a function of collision energy and for different reagent rotational
quantum numbers using the recent ab initio BW2 potential energy surface
(PES) by Bian and Werner {[}J. Chem. Phys. 112, 220 (2000)]. The results
are compared with experimental data obtained by using the
Doppler-selected time-of-flight technique. It has been found
theoretically by both the QM and QCT methods that reagent rotation
enhances reactivity in agreement with experiment. The QM results are
found to be in quantitative agreement with the experimental excitation
functions for the Cl+p-H-2 and Cl+n-H-2 reactions, whereas those
obtained quasi-classically fail to reproduce the experimental data.
These results are in strong contrast with those reported on the previous
G3 PES, in which QM and QCT calculations predicted that reactivity
decreases with reagent rotation. The intermolecular isotope effect,
i.e., the ratio between the cross sections of the Cl+n-H-2 and Cl+n-D-2
reactions, Gamma (inter)(Cl+n-H-2/Cl+n-D-2), predicted by QM
calculations on the BW2 surface is notably larger than that obtained
experimentally. (C) 2001 American Institute of Physics.},
added-at = {2019-03-01T15:49:41.000+0100},
author = {Aoiz, F. J. and Ba{\~{n}}ares, L. and Castillo, J. F. and Men{\'{e}}ndez, M. and Skouteris, D. and Werner, H. J.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/226790a40dd19cb5f567c2ac2d4cd4d74/theochem},
doi = {10.1063/1.1385155},
interhash = {3fd4a576904cccd9292a794ee1c31fd6},
intrahash = {26790a40dd19cb5f567c2ac2d4cd4d74},
issn = {00219606},
journal = {J. Chem. Phys.},
keywords = {chemie imported werner from:alexanderdenzel theoretische stuttgart theochem},
number = 5,
pages = {2074–2081},
timestamp = {2019-03-01T14:49:41.000+0100},
title = {{A quantum mechanical and quasi-classical trajectory study of the Cl+H₂ reaction and its isotopic variants: Dependence of the integral cross section on the collision energy and reagent rotation}},
url = {http://dx.doi.org/10.1063/1.1385155},
volume = 115,
year = 2001
}