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Proposal of highly accurate tests of Breit and QED effects in the ground state 2p5 of the F-like isoelectronic sequence

Li, M. C. ; Si, R. ; Brage, T. LU ; Hutton, R. LU and Zou, Y. M. (2018) In Physical Review A 98(2).
Abstract

We propose that the ground term transition, 2p5P3/22-P1/22, for ions in the F-like isoelectronic sequence could be used to accurately test current methods to compute Breit and quantum-electrodynamic (QED) effects. These systems are of interest since correlation is small due to what we will label Layzer quenching. Using the multiconfiguration Dirac-Hartee-Fock method, we investigate how correlation, Breit and QED corrections vary along the sequence and show that QED dominates over correlation already for Z≈20. We also investigate the behavior of different QED effects as a function of the nuclear charge and find that the self-energy dominates for the mid-Z range (40-80), but then decreases to change sign for Z≈90. For a few elements... (More)

We propose that the ground term transition, 2p5P3/22-P1/22, for ions in the F-like isoelectronic sequence could be used to accurately test current methods to compute Breit and quantum-electrodynamic (QED) effects. These systems are of interest since correlation is small due to what we will label Layzer quenching. Using the multiconfiguration Dirac-Hartee-Fock method, we investigate how correlation, Breit and QED corrections vary along the sequence and show that QED dominates over correlation already for Z≈20. We also investigate the behavior of different QED effects as a function of the nuclear charge and find that the self-energy dominates for the mid-Z range (40-80), but then decreases to change sign for Z≈90. For a few elements between Z=85 and 90 the vacuum polarization is the leading term, while for higher Z the two QED contributions cancel. This opens up the possibility for these ions to carefully test the frequency-dependent transverse photon correction. The uncertainties of the treatment of the well-understood frequency-independent Breit correction and correlation are expected to be at least three orders of magnitude smaller than the QED and frequency-dependent transverse photon corrections for high Z. In this work we also compare and evaluate the results from three different methods to compute self-energies.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review A
volume
98
issue
2
article number
020502
publisher
American Physical Society
external identifiers
  • scopus:85051166502
ISSN
2469-9926
DOI
10.1103/PhysRevA.98.020502
language
English
LU publication?
yes
id
07f514d6-ef0a-4889-ae40-9b733865f989
date added to LUP
2018-09-10 13:11:29
date last changed
2019-11-20 05:25:06
@article{07f514d6-ef0a-4889-ae40-9b733865f989,
  abstract     = {<p>We propose that the ground term transition, 2p5P3/22-P1/22, for ions in the F-like isoelectronic sequence could be used to accurately test current methods to compute Breit and quantum-electrodynamic (QED) effects. These systems are of interest since correlation is small due to what we will label Layzer quenching. Using the multiconfiguration Dirac-Hartee-Fock method, we investigate how correlation, Breit and QED corrections vary along the sequence and show that QED dominates over correlation already for Z≈20. We also investigate the behavior of different QED effects as a function of the nuclear charge and find that the self-energy dominates for the mid-Z range (40-80), but then decreases to change sign for Z≈90. For a few elements between Z=85 and 90 the vacuum polarization is the leading term, while for higher Z the two QED contributions cancel. This opens up the possibility for these ions to carefully test the frequency-dependent transverse photon correction. The uncertainties of the treatment of the well-understood frequency-independent Breit correction and correlation are expected to be at least three orders of magnitude smaller than the QED and frequency-dependent transverse photon corrections for high Z. In this work we also compare and evaluate the results from three different methods to compute self-energies.</p>},
  author       = {Li, M. C. and Si, R. and Brage, T. and Hutton, R. and Zou, Y. M.},
  issn         = {2469-9926},
  language     = {eng},
  month        = {08},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review A},
  title        = {Proposal of highly accurate tests of Breit and QED effects in the ground state 2p5 of the F-like isoelectronic sequence},
  url          = {http://dx.doi.org/10.1103/PhysRevA.98.020502},
  doi          = {10.1103/PhysRevA.98.020502},
  volume       = {98},
  year         = {2018},
}