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Infinite Fine Structure Coupling in Radiative Transfer Problems

  • L. F. Mcnamara (a1)

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The conditions for the equality of the line source functions associated with fine structure transitions in a multilevel atom have been examined by several authors. The equality or otherwise of the source functions depends largely on the value of the fine structure collision rate, equality occurring when this rate becomes infinitely large. The fact that the theoretical collision rates between fine structure levels of alkali atoms are so large suggests the possibility of simplifying complicated multilevel atom transfer problems by the consideration of the limit of an infinite fine structure collision rate.

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1 Avrett, E. H., Ap. J., 144, 39 (1966).
2 Jefferies, J. T., ‘Spectral Line Formation’, Ginn Blaisdell, Waltham, Mass. 1968 p. 191.
3 Dumont, S., Ann. d’Ast., 30, 421 (1967).
4 Lewis, E. L., McNamara, L. F. and Michels, H. H., Phys. Rev. A., to be published in June issue (1971).
5 Avrett, E. H. and Loeser, R., Smithsonian Astrophysical Observatory Special Report 303 (1969).
6 McNamara, L. F., to be published.

Infinite Fine Structure Coupling in Radiative Transfer Problems

  • L. F. Mcnamara (a1)

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