Theoretical Low Energy Inelastic Scattering Cross-Sections for He(2 3S) + He(1 1S) yields He(2 3P) + He(1 1S): Curve-Crossing between the C3 Sigma(+) sub g and b 3Pi sub g States of He2,
Abstract
Low energy (5-100 eV) cross sections have ben computed for the inelastic scattering of He(2 3S) + He(1 1S) yields He(2 3P) + He(1 1S). Two-state quantum-mechanical close-coupling calculations have been performed between the c 3Sigma (+) sub g and b 3Pi sub g states of the He2 molecule. The necessary molecular wavefunctions, potential curves, and rotational coupling matrix elements were obtained by ab initio computation. The inelastic transition probabilities are found to be quite large, approx 0.8 - 1.0, for impact parameters close to the curve-crossing of these two states potential curves at R sub x about 3.3 a sub o. The inelastic total corss-sections range from 10 to the -16th power sq cm at 5 eV to 4.0 x 10 to the -16 power sq cm at 100 eV. Reduced plots of the inelastic differential cross-sections show a sharp maximum at a tau = E(Theta) value of approximately 100 eV-deg. The strong inelastic process is also found to significantly alter the elastic differential cross-sections in the tau about 25-125 eV-deg region. The rotational coupling between the two states is found to be the dominant inelastic process at energies up to 500 eV.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 05, 1973
- Accession Number
- ADA098750
Entities
People
- J. C. Browne
- L. Lenamon
- R. E. Olson
Organizations
- University of Texas at Austin