Extended EUV and UV spectrum of Ne II

Abstract

Spectra of Ne emitted by a Penning discharge were recorded in the extreme ultraviolet (EUV) on a 10.7 m grazing-incidence spectrograph with phosphor image plates. The spectra provided 75 new lines of Ne II between 286 and 325 Å, from which 35 new energy levels of Ne II could be established. With these new levels, 86 unidentified lines from the NIST Pt–Ne atlas (Sansonetti J E et al 1992 J. Res. Natl. Inst. Stand. Technol. 97 1) could be classified. The identifications of two existing levels of Ne II were revised.