Abstract
A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, Ar III) spectra in the 480–6218 Å region. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified for the first time. We extended the analysis of Ar III to five new energy levels belonging to 3s23p34d, 3s23p35s odd configurations. For Ar IV, 10 new energy levels of the 3s23p23d and 3s23p24p even and odd configurations, respectively, are presented. For the prediction of energy levels, line transitions, and transition probabilities, relativistic Hartree–Fock calculations were used.
Highlights
Spectral analysis of several ions of argon has implications in different fields
Five new energy levels belonging to 3s2 3p3 4d, 3s2 3p3 5s odd configurations of Ar III and 10 new energy levels of the 3s2 3p2 3d and
We used Cowan’s atomic structure package [20], with corrections to the code made by Kramida [21] due to an error in Cowan’s atomic structure theory, to calculate the solution for relativistic Hartree–Fock (HF) equations including configuration interaction for Ar III and Ar IV
Summary
Spectral analysis of several ions of argon has implications in different fields. Argon plasma sources are applied in various fields of industry and research [4,5,6,7]. The report by Hansen and Persson [9] that presented a revised and extended analysis of the optical spectrum of Ar III is noteworthy. They used hollow cathode and theta-pinch sources analyzing the 3s2 3p4 , 3s3p5 , 3p6 , 3s2 3p3 4s, 3s2 3p3 4p, and 3s2 3p3 3d configurations
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