Atomic Data and Spectral Line Intensities for S X
Abstract
Electron impact collision strengths, energy levels, oscillator strengths and spontaneous radiative decay rates are calculated for S X. The configurations included are 2s^{2}2p^{3}, 2s2p^{4}, 2p^{5}, 2s^{2}2p^{2}3s, 2s^{2}2p^{2}3p, and 2s^{2}2p^{2}3d giving rise to 72 finestructure levels in intermediate coupling. Collision strengths are calculated at five incident energies, 25, 50, 75, 100, and 125 ryd. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates, statistical equilibrium equations for level populations are solved. Proton excitation rates between the levels of the ground configuration have also been calculated and included in the statistical equilibrium equations. The predicted S X line intensities are compared with SUMER observations of the quiet Sun.
 Publication:

The Astrophysical Journal Supplement Series
 Pub Date:
 August 2003
 DOI:
 10.1086/375721
 Bibcode:
 2003ApJS..147..409B
 Keywords:

 Atomic Data;
 Plasmas