A Multiplet Table for Neutral Helium ( 4 He i ) with Transition Rates

Abstract

This paper combines the precise determination of the energy levels of 4 He I from calculations andexperiments with theoretical transition probabilities to present multiplet tables and finding listsfor the fine structure of the helium atom. The tabulated transition rates and oscillator strengthsinclude corrections for singlet-triplet mixing and spin-orbit coupling, but not the higher orderrelativistic terms nor the finite nuclear mass, although the latter are tabulated for future use.The results are consistent with laboratory lifetimes and oscillator strengths, but very fewmeasurements are accurate enough to be stringent tests. An Appendix discusses the corrections forfinite nuclear mass.