Shift and width of the Lyman-. alpha. line of neutral hydrogen due to electron collisions
Journal Article
·
· Physical Review, A; (USA)
- Department of Physics, Louisiana State University, Baton Rouge, Louisiana 70803-4001 (USA) Department of Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001 (USA)
The convergence of the quantum-mechanical (impact-theory) partial-wave series for the shift {ital d} and width {ital w} of the Lyman-{alpha} line due to electron collisions in a plasma is studied. Asymptotically exact expressions for the relevant {ital S}-matrix elements are derived, and it is shown that the series for {ital d} converges, whereas {ital w} diverges logarithmically as in semiclassical theories. The conclusions are verified by numerical calculations. Some numerical results are reported for plasmas with temperatures in the range 1--5 eV and densities 2{times}10{sup 17} and 4{times}10{sup 17} cm{sup {minus}3}.
- OSTI ID:
- 5518972
- Journal Information:
- Physical Review, A; (USA), Journal Name: Physical Review, A; (USA) Vol. 43:7; ISSN 1050-2947; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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