Multichannel quantum defect theory of strontium bound Rydberg states

Vaillant, CL; Jones, MPA; Potvliege, RM

Abstract

Using the reactance matrix approach, we systematically develop new multichannel quantum defect theory (MQDT) models for the singlet and triplet S, P, D and F states of strontium below the first ionization limit, based on improved energy level measurements. The new models reveal additional insights into the character of doubly excited perturber states, and the improved energy level measurements for certain series allow fine structure to be resolved for those series' perturbers. Comparison between the predictions of the new models and those of previous empirical and ab initio studies reveals good agreement with most series; however, some discrepancies are highlighted. Using the MQDT wave functions derived from our models we calculate other observables such as Landé ${{g}_{J}}$-factors and radiative lifetimes. The analysis reveals the impact of perturbers on the Rydberg state properties of divalent atoms, highlighting the importance of including two-electron effects in the calculations of these properties. The work enables future investigations of properties such as Stark maps and long-range interactions of Rydberg states of strontium.

Citation

Vaillant, C., Jones, M., & Potvliege, R. (2014). Multichannel quantum defect theory of strontium bound Rydberg states. Journal of Physics B: Atomic, Molecular and Optical Physics, 47(15), Article 155001. https://doi.org/10.1088/0953-4075/47/15/155001

• Journal Article Type: Article
• Acceptance Date: Jun 12, 2014
• Online Publication Date: Jul 15, 2014
• Publication Date: Jan 1, 2014
• Deposit Date: Jul 8, 2014
• Publicly Available Date: Jul 16, 2014
• Journal: Journal of Physics B: Atomic, Molecular and Optical Physics
• Print ISSN: 0953-4075
• Electronic ISSN: 1361-6455
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 47
• Issue: 15
• Article Number: 155001
• DOI: https://doi.org/10.1088/0953-4075/47/15/155001
• Keywords: Perturbation theory, Oscillator strengths, Lifetimes, Transition moments, Fine and hyperfine structure.
• Public URL: https://durham-repository.worktribe.com/output/1448350