Direct ionization in the quasimolecule H-He
- A. F. Ioffe Physical Technical Institute, 194021 St. Petersburg (Russia)
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1501 (United States)
Doubly differential cross sections for electron ejection in H-He collisions have been measured in the incident atom energy range 2.3{endash}10 keV. Analysis of the experimental data on the basis of the adiabatic theory of direct ionization has been made and parameters of the quasimolecule, namely, the energy of the initial 2{ital p}{sigma} state coupled with the continuum, the effective charge, and the real and imaginary parts of the internuclear distance at which the {open_quote}{open_quote}superpromoted{close_quote}{close_quote} diabatic term crosses boundary of continuum, have been determined. The values of the initial-state energy and the effective charge agree well with the corresponding parameters of the Li united atom, whereas the dynamical characteristics Re{ital R}({ital E}) and Im{ital R}({ital E}) reveal considerable influence of electron correlations. The possibility for the development of an alternative method of quantitative spectroscopy of quasimolecules based on the analysis of experimental data on differential cross sections for direct ionization is discussed. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 279922
- Journal Information:
- Physical Review A, Vol. 53, Issue 4; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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