Spectral properties of endohedrally confined helium atom

Fang Shuai-Shuai†, Hao-Xue Qiao

The 2¹S₀ −2¹P₁ and 2¹S₀–3¹P₁ oscillator strengths of confined helium with changing depth of the outer confining potential well; inset shows the enlarged figure of the dotted box. (a) The 2¹S₀–2¹P₁ oscillator strength, (b) the 2¹S₀–3¹P₁ oscillator strength.