A collision-induced satellite in the Lyman β profile due to H-H collisions - Lyman β satellites

Issue		Eur. Phys. J. D Volume 12, Number 2, November 2000


Page(s)		263 - 268
DOI		http://dx.doi.org/10.1007/s100530070021

Eur. Phys. J. D 12, 263-268

Lyman $\beta$ satellites

A collision-induced satellite in the Lyman $\beta$ profile
due to H-H collisions

N.F. Allard^1,2 - J. Kielkopf³ - I. Drira¹ - P. Schmelcher⁴

¹ Observatoire de Paris-Meudon, Département Atomes et Molécules en Astrophysique, 92195 Meudon Principal Cedex, France
² CNRS, Institut d'Astrophysique, 98bis boulevard Arago, 75014 Paris, France
³ Department of Physics, University of Louisville, Louisville, Ky 40292, USA
⁴ Institut für Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany

allard@iap.fr
john@aurora.physics.louisville.edu
Ikhlas.Drira@obspm.fr
peter@tc.pci.uni-heidelberg.de

Received 15 January 2000 and Received in final form 17 May 2000

Abstract
We present a theoretical profile of the Lyman $\beta$ 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 $\beta$ , correlated to the $\mathrm{B}''\bar{\mathrm{B}}\;^1\Sigma^+_u{-}\mathrm{X}\;^1\Sigma^+_g$ asymptotically forbidden transition of H₂. As a consequence, the appearance of the line wing between Lyman $\alpha$ and Lyman $\beta$ 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.

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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A collision-induced satellite in the Lyman profile due to H-H collisions

A collision-induced satellite in the Lyman $\beta$ profile
due to H-H collisions