Persistent Lines of Singly Ionized Helium ( He II )

Wavelength  Energy         Configuration Term   J  
   (Å)      Levels (cm-1)

  256.3166       0.0000    1s            2S     1/2
            390142.5605    3p            2P°    3/2
  return
 
  256.3177       0.0000    1s            2S     1/2
            390140.8250    3p            2P°    1/2
  return
 
  303.7804       0.0000    1s            2S     1/2
            329185.1511    2p            2P°    3/2
  return
 
  303.7858       0.0000    1s            2S     1/2
            329179.2940    2p            2P°    1/2
  return
 
 1640.3321  329179.2940    2p            2P°    1/2
            390142.5576    3d            2D     3/2
  return
 
 1640.3447  329179.7623    2s            2S     1/2
            390142.5605    3p            2P°    3/2
  return
 
 1640.3750  329179.2940    2p            2P°    1/2
            390140.9646    3s            2S     1/2
  return
 
 1640.3914  329179.7623    2s            2S     1/2
            390140.8250    3p            2P°    1/2
  return
 
 1640.4742  329185.1511    2p            2P°    3/2
            390143.1361    3d            2D     5/2
  return
 
 1640.4897  329185.1511    2p            2P°    3/2
            390142.5576    3d            2D     3/2
  return
 
 1640.5326  329185.1511    2p            2P°    3/2
            390140.9646    3s            2S     1/2
  return
 
 4685.3769  390140.8250    3p            2P°    1/2
            411477.8537    4d            2D     3/2
  return
 
 4685.4072  390140.9646    3s            2S     1/2
            411477.8550    4p            2P°    3/2
  return
 
 4685.7038  390142.5576    3d            2D     3/2
            411478.0973    4f            2F°    5/2
  return
 
 4685.7044  390142.5605    3p            2P°    3/2
            411478.0978    4d            2D     5/2
  return
 
 4685.8041  390143.1361    3d            2D     5/2
            411478.2193    4f            2F°    7/2
  return