Avoided level crossings in very highly charged ions

Beiersdorfer, P.; Scofield, J. H.; Brown, G. V.; Chen, M. H.; Hell, N.; Osterheld, A. L.; Vogel, D. A.; Wong, K. L.

doi:10.1103/PhysRevA.93.051403

Title: Avoided level crossings in very highly charged ions

Journal Article · Fri May 13 00:00:00 EDT 2016 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.93.051403· OSTI ID:1406428

Beiersdorfer, P. ^[1]; Scofield, J. H. ^[1]; Brown, G. V. ^[1]; Chen, M. H. ^[1]; Hell, N. ^[1]; Osterheld, A. L. ^[1]; Vogel, D. A. ^[1]; Wong, K. L. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

In this paper, we report a systematic measurement of the (2p$$-1\atop{1/2}$$3d_3/2)_J=1 and (2s$$-1\atop{1/2}$$3p_1/2)_J=1 levels in 14 neonlike ions between Ba⁴⁶⁺ and Pb⁷²⁺ and document the effects of their avoided crossing near Z = 68. Strong mixing affects the oscillator strengths over a surprisingly wide range of atomic numbers and leads to the vanishing of one transition two atomic numbers below the crossing. The crossing voids the otherwise correct expectation that the (2p$$-1\atop{1/2}$$3d_3/2)_J=1 level energy is only weakly affected by quantum electrodynamics (QED). For about 10 atomic numbers surrounding the crossing, its QED contributions are anomalously large, attaining almost equality to those affecting the (2s$$-1\atop{1/2}$$3p_1/2)_J=1 level. As a result, the accuracy of energy level calculations appears compromised near the crossing.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1406428

Alternate ID(s):: OSTI ID: 1253195

Report Number(s):: LLNL-JRNL-678414; PLRAAN

Journal Information:: Physical Review A, Vol. 93, Issue 5; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Relativistic calculations on the ${{\rm{K}}}_{\alpha }$ x-ray satellites of platinum with multiply ionized L shell Natarajan, L. Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 52, Issue 1 https://doi.org/10.1088/1361-6455/aaed67	journal	November 2018

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