Spin-orbit effects on photoionization-produced alignment of the Ar+ 3p(4)(P-3)4p levels

H W van der Hart, C H Greene

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10 Citations (Scopus)


We have determined photoionization spectra of Ar with excitation of the 3p(4)(P-3)4p states emphasizing the effects of two different classes of Ar+ spin-orbit interactions. The spin-orbit splitting of each Ar+ state adequately describes the resonant excitation of the quartet states of Ar+, and gives Ar photoionization cross sections with excitation of the 3p4(3P)4p P-2(3/2)o and P-4(5/2)o levels of Ar+ in sufficiently good agreement with experiment to identify the observed resonances and to estimate the excitation strengths. In addition, we demonstrate the importance of spin-orbit induced mixing of different Ar+ LS-coupled states for observables such as the alignment of the 3p(4)(P-3)4p P-4(5/2)o level and the excitation of Rydberg series converging to the 3p(4)(P-3)4p S-2(o) and S-4(o) thresholds.

Original languageEnglish
Pages (from-to)4029-4037
Number of pages9
JournalJournal of Physics B: Atomic Molecular and Optical Physics
Issue number16
Publication statusPublished - 28 Aug 1999


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