Screening-Constant-by-Unit-Nuclear-Charge method investigations of high lying () , Rydberg series in the photoionization spectra of the halogen-like ion Kr+

Energy positions and quantum defects of the 4 s 2 4 p 4 ( 1 D 2 , 1 S 0 ) n s , n d Rydberg series originating from the 4 s 2 4 p 5 2 P 3 / 2 ∘ ground state and from the 4 s 2 4 p 5 2 P 1 / 2 ∘ metastable state of Kr+ are reported. Calculations are performed using the Screening Constant by Unit Nuclear Charge (SCUNC) method. The results obtained are in suitable agreement with recent experimental data from the combined ASTRID merged-beam set up and Fourier Transform Ion Cyclotron Resonance device (Bizau et al., 2011), ALS measurements (Hinojosa et al., 2012), and multi-channel R -matrix eigenphase derivative calculations (McLaughlin and Balance, 2012). In addition, analysis of the 4 s 2 4 p 4 ( 1 D 2 ) n d and the 4 s 2 4 p 4 ( 1 S 0 ) n d resonances is given via the SCUNC procedure. The excellent results obtained from our work point out that the SCUNC formalism may be used to confirm the results of the analysis from the standard quantum-defect expansion formulas. Eventual errors occurring in the analysis can then be automatically detected and corrected via the SCUNC procedure.