skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Determination of the long range nonreactive anisotropic potential of H+Cl/sub 2/ and H+Br/sub 2/ from nonreactive scattering experiments

Abstract

Total differential and integral cross sections have been measured for the nonreactive scattering of H atoms from Cl/sub 2/ and Br/sub 2/. The differential cross sections were measured with a velocity selected beam at two center of mass energies, 0.17 and 0.78 eV, and the integral cross sections covered the center of mass energy range 0.01 to 1.2 eV. The results can be reasonably well explained by a spherically symmetric Lennard-Jones (12,6) potential for which the well depth and location are determined. The experimental results are shown to be in definite disagreement with cross sections calculated for the currently accepted LEPS potential surface. The fit of the experimental data is improved by including the effect of the anisotropy, which is accounted for by using the infinite order sudden approximation. A remaining discrepancy in the integral cross sections at high collision energies can be explained by introducing a plateau in the repulsive part of the Lennard-Jones potential to take into account the distortion due to the chemical potential. This new potential model is used to predict new cross section features outside the range of the present experiments.

Authors:
; ; ;
Publication Date:
Research Org.:
Max-Planck-Institut fuer Stroemungsforschung, 34 Goettingen, Federal Republic of Germany
OSTI Identifier:
7208061
Resource Type:
Journal Article
Journal Name:
J. Chem. Phys.; (United States)
Additional Journal Information:
Journal Volume: 68:8
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; BROMINE; ATOM-MOLECULE COLLISIONS; CHLORINE; HYDROGEN; DIFFERENTIAL CROSS SECTIONS; INTERMOLECULAR FORCES; LENNARD-JONES POTENTIAL; MILLI EV RANGE; ATOM COLLISIONS; COLLISIONS; CROSS SECTIONS; CRYOGENIC FLUIDS; ELEMENTS; ENERGY RANGE; EV RANGE; FLUIDS; HALOGENS; MOLECULE COLLISIONS; NONMETALS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats

Bauer, W, Shobatake, K, Toennies, J P, and Walaschewski, K. Determination of the long range nonreactive anisotropic potential of H+Cl/sub 2/ and H+Br/sub 2/ from nonreactive scattering experiments. United States: N. p., 1978. Web.
Bauer, W, Shobatake, K, Toennies, J P, & Walaschewski, K. Determination of the long range nonreactive anisotropic potential of H+Cl/sub 2/ and H+Br/sub 2/ from nonreactive scattering experiments. United States.
Bauer, W, Shobatake, K, Toennies, J P, and Walaschewski, K. Sat . "Determination of the long range nonreactive anisotropic potential of H+Cl/sub 2/ and H+Br/sub 2/ from nonreactive scattering experiments". United States.
@article{osti_7208061,
title = {Determination of the long range nonreactive anisotropic potential of H+Cl/sub 2/ and H+Br/sub 2/ from nonreactive scattering experiments},
author = {Bauer, W and Shobatake, K and Toennies, J P and Walaschewski, K},
abstractNote = {Total differential and integral cross sections have been measured for the nonreactive scattering of H atoms from Cl/sub 2/ and Br/sub 2/. The differential cross sections were measured with a velocity selected beam at two center of mass energies, 0.17 and 0.78 eV, and the integral cross sections covered the center of mass energy range 0.01 to 1.2 eV. The results can be reasonably well explained by a spherically symmetric Lennard-Jones (12,6) potential for which the well depth and location are determined. The experimental results are shown to be in definite disagreement with cross sections calculated for the currently accepted LEPS potential surface. The fit of the experimental data is improved by including the effect of the anisotropy, which is accounted for by using the infinite order sudden approximation. A remaining discrepancy in the integral cross sections at high collision energies can be explained by introducing a plateau in the repulsive part of the Lennard-Jones potential to take into account the distortion due to the chemical potential. This new potential model is used to predict new cross section features outside the range of the present experiments.},
doi = {},
url = {https://www.osti.gov/biblio/7208061}, journal = {J. Chem. Phys.; (United States)},
number = ,
volume = 68:8,
place = {United States},
year = {1978},
month = {4}
}