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Title: Parametric CI+MBPT calculations of Th I energies and g-factors for even states

Journal Article · · Journal of Physics. B, Atomic, Molecular and Optical Physics
ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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In this study, we study energies and g-factors for a large number of levels of Th I. We found that the accuracy of configuration-interaction many-body perturbation theory can be substantially improved by using multiple adjustment parameters, which are introduced to regulate the second-order MBPT corrections for single-valence energies and Coulomb interaction. The results for energies and g-factors are in excellent agreement with experiment, with accuracy sufficient to positively assign theoretical states of given angular momentum and parity to experimental levels. Finally, this theory will be further developed in the future to treat other, even more complicated, actinides such as U I.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1458954
Alternate ID(s):
OSTI ID: 22656240
Report Number(s):
LA-UR--17-21886
Journal Information:
Journal of Physics. B, Atomic, Molecular and Optical Physics, Journal Name: Journal of Physics. B, Atomic, Molecular and Optical Physics Journal Issue: 16 Vol. 50; ISSN 0953-4075
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (11)

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On the use of the Cowan’s code for atomic structure calculations in singly ionized lanthanides journal July 1999
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Summation of the perturbation theory high order contributions to the correlation correction for the energy levels of the caesium atom journal October 1989
Calculation of parity non-conservation in thallium journal July 1987
THE SPECTRUM OF THORIUM FROM 250 nm TO 5500 nm: RITZ WAVELENGTHS AND OPTIMIZED ENERGY LEVELS journal February 2014
Configuration-interaction many-body-perturbation-theory energy levels of four-valent Si i journal February 2015
Calculation of the energy levels of Ge, Sn, Pb, and their ions in the V N − 4 approximation journal June 2005
Relativistic all-order calculations of Th, Th + , and Th 2 + atomic properties journal September 2014
Calculation of isotope shifts and relativistic shifts in C I, C II, C III, and C IV journal January 2006

Cited By (3)

Relativistic configuration-interaction calculations of U I hyperfine constants text January 2020
CI+MBPT calculations of Ar I energies, g factors, and transition line strengths journal March 2018
Cowan Code: 50 Years of Growing Impact on Atomic Physics journal July 2019

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74 ATOMIC AND MOLECULAR PHYSICS