Abstract
The spectrum of singly ionized neon emitted by a hollow-cathode discharge has been observed in the 11 000-300 Å range. Wavelengths have been determined for 1 250 Ne II lines of which about 950 are new. The extended wavelength observations have led to the finding of more than 220 new energy levels, which means that in all 301 Ne II levels, belonging to the configurations 2s22p5, 2s2p6, 2s22p43s-7s, 3p-5p, 3d-5d, 4f-9f, and 5g-7g are now known. The derived term system has been fixed in relation to the ground term using improved values for the wavelengths of the resonance lines 2s22p52P1½,½-2s2p62S½ at 460.7284 and 462.3908 Å. The 3P2 ionization limit has been determined to be (330 388.6±0.3) cm-1 above the ground level. Accurate wavelengths, useful as reference wavelengths, have been calculated in the 2 000-1 000 Å and 460-300 Å regions.
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