Energy levels of high l-states in neutral and singly ionized argon

The spectra of Cu, Mg and V, produced by a hollow cathode with Ar and Ne as carrier gases, have been registered in the infrared region (1800-9000 cm-1) with the Fourier-Transform spectrometer at the National Solar Observatory on Kitt Peak. Four groups of lines around 2.6, 4.0, 4.6 and 4.7 μm have been investigated. Many of these emission lines have been identified as 3p5(2P)3d-4f, 4f-5g, 4f - 6g, 4f - 7g, 5f - 7g and 5g-7h transitions in Ar I and, 3p4(3P)7h - 8i and 7i - 8k transitions in Ar II. From these observations, it has been possible to determine the energies of 29 new levels belonging to the 3p5(2P)6g, 7g and 7h configurations in Ar I and to the 3p4(3P)8i and 8k configurations in Ar II. (orig.)