A&A 396, 337-344 (2002)
DOI: 10.1051/0004-6361:20021350

Energy levels and structural properties of compressed hydrogen atom under Debye screening

B. Saha¹, P. K. Mukherjee¹ and G. H. F. Diercksen<sup>2

1</sup>  Department of Spectroscopy, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
²  Max-Planck-Institut für Astrophysik, Karl-Schwarzschild Strasse 1, 85741 Garching, Germany

(Received 10 June 2002 / Accepted 16 September 2002 )

Abstract
Time dependent variation perturbation calculations have been performed for estimating the transition energies, oscillator strengths and transition probability values for a few dipole allowed states of compressed hydrogen atom confined in a weakly coupled plasma. The compression is obtained by embedding the atom at the centre of an impenetrable spherical box. The dipole polarizability of the atom is evaluated at each confinement radius with respect to different plasma screening parameters. The effect of pressure due to spatial confinement on the dipole polarizability and other atomic properties is analyzed. Results obtained are useful for the diagnostic determination of astrophysical and laboratory plasmas and for the calculation of collision rate coefficients needed for computing opacity of stellar envelopes - a quantity of importance in the context of stellar structure and pulsations.

Key words: atomic data -- atomic processes

Offprint request: P. K. Mukherjee, sppkm@mahendra.iacs.res.in

© ESO 2002

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