Spectral properties of endohedrally confined helium atom

Fang Shuai-Shuai†, Hao-Xue Qiao

The ratio of the states involved in the dipole transition. (a) The dipole transition of 1¹S₀–2¹P₁, (b) the dipole transition of 1¹S₀–3¹P₁, (c) the dipole transition of 2¹S₀–2¹P₁, (d) the dipole transition of 2¹S₀–3¹P₁.