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A collision-induced satellite in the Lyman profile due to H-H collisions |
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| Authors: | N.F. Allard J. Kielkopf I. Drira P. Schmelcher |
| Affiliation: | Observatoire de Paris-Meudon, Département Atomes et Molécules en Astrophysique, 92195 Meudon Principal Cedex, France, FR Department of Physics, University of Louisville, Louisville, Ky 40292, USA, US Institut für Physikalische Chemie, Universit?t Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany, DE |
| Abstract: | We present a theoretical profile of the Lyman line of atomic hydrogen perturbed by collisions with neutral hydrogen atoms and protons. We use a general unified theory in which the electric dipole moment varies during a collision. A collision-induced satellite appears on Lyman , correlated to the asymptotically forbidden transition of H2. As a consequence, the appearance of the line wing between Lyman and Lyman is shown to be sensitive to the relative abundance of hydrogen ions and neutral atoms, and thereby to provide a temperature diagnostic for stellar atmospheres and laboratory plasmas. Received 15 January 2000 and Received in final form 17 May 2000 |
| Keywords: | PACS. 32.70.Jz Line shapes, widths, and shifts – 52.25.Qt Emission, absorption, and scattering of ultraviolet radiation - 95.30.Dr Atomic processes and interactions |
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