The 2p43s, 3p and 3d configurations in Ar X

Abstract

The spectrum of nine times ionized argon, Ar X, has been studied in the wavelength range 500-800 Å using the beam-foil technique. Twenty-eight new lines of the type 3s-3p and 3p-3d have been identified, and 40 energy levels in the 2p43s, 3p and 3d configurations are established by combining the newly observed transitions with previously known data. The identifications are supported by isoelectronic comparisons of wavenumbers, energy levels and Slater parameters along the isoelectronic sequence.