Astron. Astrophys. Suppl. Ser. 146, 481-498

${\rm He} (1\,^1{\rm S},\, 2\,^3{\rm S},\, 2\,^1{\rm S},\, 2\,^3{\rm P} \to \, n\, ^{1,3} L)$: Thermally averaged electron collision strengths for $n \leq 5$

I. Bray¹ - A. Burgess² - D.V. Fursa¹ - J.A. Tully³

Send offprint request: J.A. Tully, e-mail: tully@obs-azur.fr

1 - Department of Physics, The Flinders University of South Australia, P.O. Box 2100, Adelaide 5001, Australia
2 - Department of Applied Mathematics and Theoretical Physics, Silver Street, Cambridge CB3 9EW, UK
3 - Département Gian Domenico Cassini, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France

Received March 2; accepted August 16, 2000

Abstract:

We present thermally averaged collision strengths for electron induced transitions in helium from $\rm 1s^2\,\,^1S$, $\rm 1s2s\,\,^{1,3}S$, $\rm 1s2p\,\,^3P$ to higher lying terms ${\rm 1s}nl\,\,^{1,3}L$ with $n \leq 5$. Results are tabulated as functions of temperature in the range $3.75 \leq {\rm log}\,T \leq 5.75$. Cross sections are calculated using the convergent close-coupling (CCC) method.

Key words: atomic data