Calculation of the excitation cross sections for the {sup 1}{Sigma}{sub u}{sup +} and {ital C} {sup 1}{Pi}{sub u}{sup +} states in {ital e}-H{sub 2} scattering at 60 eV
- Center for Theoretical Studies of Physical Systems and the Department of Physics, Clark Atlanta University, Atlanta, Georgia 30314 (United States)
Integral cross sections have been calculated for the dipole-allowed transitions from {ital X} {sup 1}{Sigma}{sub g}{sup +} to the {sup 1}{Sigma}{sub u}{sup +} and the {ital C} {sup 1}{Pi}{sub u}{sup +} states in electron--hydrogen-molecule scattering at 60 eV. Experimental data and a universal function [A. Z. Msezane and I. A. Sakmar, Phys. Rev. A 49, 2405 (1994)], which can extrapolate the generalized oscillator strength through the nonphysical region to {ital K}{sup 2} (momentum transfer squared) =0, have been used in the calculation. A better agreement between theoretical results and experimental data has been achieved by using the universal function in the range of small scattering angles ({theta}{lt}10{degree}). The results show that the extrapolation used by experimentalists underestimated the differential cross sections (DCS`s) at small scattering angles. Our calculation suggests that the universal function can be used to extrapolate the DCS for the electron-molecule scattering down to 0{degree} at high energy.
- OSTI ID:
- 44649
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 51; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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