Isotope shift measurements in 94 spectral lines of singly-ionized dysprosium atom (Dy+) in 330–385 nm region and comments on the electronic configuration assignments to the odd and even-parity energy levels of Dy II

• Published in: The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2022-11, Vol.76 (11), Article 221
• Main Authors: Afzal, S. M., Ahmad, S. A.
• Format: Article
• Language: English
• Subjects: Applications of Nonlinear Dynamics and Chaos Theory; Atomic; Composition; Configurations; Dysprosium isotopes; Energy; Energy levels; Evaluation; Line spectra; Molecular; Optical and Plasma Physics; Parity; Physical Chemistry; Physics; Physics and Astronomy; Quantum Information Technology; Quantum Physics; Regular Article – Atomic Physics; Spectroscopy/Spectrometry; Spintronics
• ISSN: 1434-6060; 1434-6079
• DOI: 10.1140/epjd/s10053-022-00536-x

Isotope shift (IS) Δ ν ( 160 Dy −  164 Dy) measurements in 94 spectral lines of singly-ionized dysprosium atom (Dy II) in 330–385 nm were carried out on a Recording Fabry–Perot Spectrometer using highly enriched 160 Dy and 164 Dy isotopes. IS data for 72 spectral lines of Dy II are being reported for the first time. The level isotope shift Δ T ( 160 Dy −  164 Dy) has been evaluated for 74 odd-parity energy levels. Experimentally evaluated level isotope shift Δ T of the energy levels are sensitive probe to check the theoretical composition of the mixed configurations assigned to the energy levels. The verification of the theoretical composition of 29 odd-parity levels assigned earlier to [4 f 9 (5 d  + 6 s ) 2  + 4 f 10 6 p ] configurations has been carried out and good agreement has been observed between the theoretically expected and the experimentally evaluated level isotope shifts Δ T values within the available accuracy of our measurements. The known odd-parity energy levels of Dy II between 32,000 and 46,000 cm −1 have no configuration assignments and presently it is not easy to carry out theoretical calculation of the energy levels in this region. The present study has enabled us to evaluate Δ T values of 35 unassigned high lying odd-parity energy levels lying in between 33,000 and 39,600 cm −1 . These Δ T values have been used to suggest the possible dominant electronic configurations to these unassigned high lying odd- parity energy levels: 8 levels to 4 f 10 6 p configuration, 1 level to 4 f 9 5 d 2 , 13 levels to (4 f 10 6 p  + 4 f 9 5 d 2 ) and 13 levels to (4 f 10 6 p  + 4 f 9 5 d 2  + 4 f 9 5 d 6 s ). The observed isotope shifts in 13 spectral lines involving transitions from the high even-parity levels of 4 f 9 5 d 6 p and 4 f 9 6 s 6 p to the low odd-parity energy levels of 4 f 9 5 d 6 s has enabled the confirmation of the assignments of 10 energy levels to 4 f 9 5 d 6 s , 10 levels to 4 f 9 5 d 6 p and 3 levels to 4 f 9 6 s 6 p configuration. Graphical abstract