Energy Levels of Singly Ionized Helium ( He II )
Configuration Term J Level(cm-1) Ref.
1s 2S 1/2 0.0000 MK00b
2p 2P° 1/2 329179.2940 MK00b
2p 2P° 3/2 329185.1511 MK00b
2s 2S 1/2 329179.7623 MK00b
3p 2P° 1/2 390140.8250 MK00b
3p 2P° 3/2 390142.5605 MK00b
3s 2S 1/2 390140.9646 MK00b
3d 2D 3/2 390142.5576 MK00b
3d 2D 5/2 390143.1361 MK00b
4p 2P° 1/2 411477.1228 MK00b
4p 2P° 3/2 411477.8550 MK00b
4s 2S 1/2 411477.1818 MK00b
4d 2D 3/2 411477.8537 MK00b
4d 2D 5/2 411478.0978 MK00b
4f 2F° 5/2 411478.0973 MK00b
4f 2F° 7/2 411478.2193 MK00b
He Limit 438908.8789 MK00b