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

Journal Article · Sat Apr 15 04:00:00 EST 1978 · J. Chem. Phys.; (United States)

OSTI ID:7208061

Bauer, W; Shobatake, K; Toennies, J P; Walaschewski, K

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.

• Research Organization: Max-Planck-Institut fuer Stroemungsforschung, 34 Goettingen, Federal Republic of Germany
• OSTI ID: 7208061
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 68:8; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
BROMINE
CHLORINE
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
DIFFERENTIAL CROSS SECTIONS
ELEMENTS
ENERGY RANGE
EV RANGE
FLUIDS
HALOGENS
HYDROGEN
INTERMOLECULAR FORCES
LENNARD-JONES POTENTIAL
MILLI EV RANGE
MOLECULE COLLISIONS
NONMETALS