High-resolution extreme-ultraviolet spectrum of He between 35 and 55 eV

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Abstract
The photon emission spectrum from He between 35 and 55 eV has been studied by means of a 3-m normal-incidence grating spectrometer. The radiation was generated by a new vuv-microwave source employing cyclotron resonance obtained by a static magnetic field. A large number of lines have been observed in the spectrum. Many Rydberg series have been identified not only for singly excited atoms but also for doubly excited atoms. The series involve both singlet and triplet states. The energy of many doubly excited states have been determined more accurately than in previous studies and in addition some new energies have been measured. The lines observed correspond to both one-electron and two-electron transitions, indicating that configuration interaction is important.