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Population of Excited States of Al10+ in a Plasma by a Time-Dependent Model

Published online by Cambridge University Press:  12 April 2016

H. Guennou  and
A. Sureau
H. Guennou
Affiliation:
Laboratoire de Spectroscopic Atomique et Ionique, Université Paris-Sud and C.N.R.S. Orsay, France
A. Sureau
Affiliation:
Laboratoire de Spectroscopic Atomique et Ionique, Université Paris-Sud and C.N.R.S. Orsay, France

Extract

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The present model is the time-dependent version of a previous model (Sureau et al. 1983) in which the population distribution was assumed in steady state. A finite set of levels is partitioned in four subsets: the Z-ion ground-level and, contingently, the first near-degenerated levels (subset 1); all the successive excited Z-ion levels up to n=5 (subset 2); a finite number of higher Rydberg levels (because of the limitation of the series in the plasmas) which are assumed in LTE with the Z+l−ion ground-level (subset 3, called the thermal band); and the Z+l ion ground-level (subset 4).

The physical processes explicitly considered are the radiative cascades and the transitions between the Z-ion bound levels induced by electron-ion collisions. The radiative-transition probabilities are given by ab-initio calculations using a modified Hartree-Fock method including the spin-orbit interaction (Sureau et al., 1984). The collision rates are derived by the Van Regemorter formula multiplied by an adjustable parameter Fc.

Type
Session 6. Poster Papers
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 221 - 224
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

References

Sureau, A., Guennou, H., Jaeglé, P., 1983 Communication at the 4 Topical Conference on Atomic Processes in High Temperature Plasmas, Princeton (N.J.) April 1983 Google Scholar
Sureau, A., Guennou, H. and Cornilie, M., 1984 J. Phys. B: At. Mol. Phys., 17, 541 CrossRefGoogle Scholar
Gauthier, J.C., Geindre, J.P., Grandjouan, N., Virmont, J., 1983 J. Phys. D, 16, 321 CrossRefGoogle Scholar