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Title: Avoided level crossings in very highly charged ions

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 Ba 46+ and Pb 72+ 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.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-678414
Journal ID: ISSN 2469-9926; PLRAAN
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 93; Journal Issue: 5; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1406428
Alternate Identifier(s):
OSTI ID: 1253195