${\Rm He} (1\,^1{\rm S},\, 2\,^3{\rm S},\, 2\,^1{\rm S},\, 2\,^3{\rm P} \To \, N\, ^{1,3} L)$: Thermally Averaged Electron Collision Strengths for $N \Leq 5$

Astronomy and Astrophysics Supplement Series

doi 10.1051/aas:2000277