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Multichannel quantum defect theory of strontium bound Rydberg states

Vaillant, C L and Jones, M P A and Potvliege, R M (2014) 'Multichannel quantum defect theory of strontium bound Rydberg states.', Journal of physics B : atomic, molecular and optical physics., 47 (15). p. 155001.


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.

Item Type:Article
Keywords:Perturbation theory, Oscillator strengths, Lifetimes, Transition moments, Fine and hyperfine structure.
Full text:(AM) Accepted Manuscript
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Publisher statement:© 2014 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Journal of physics B : atomic, molecular and optical physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.1088/0953-4075/47/15/155001
Date accepted:12 June 2014
Date deposited:16 July 2014
Date of first online publication:15 July 2014
Date first made open access:No date available

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