Relativistic many-body calculation of energies, lifetimes, hyperfine constants, and polarizabilities in L7i

W. R. Johnson, U. I. Safronova, A. Derevianko, and M. S. Safronova
Phys. Rev. A 77, 022510 – Published 29 February 2008

Abstract

The excitation energies of ns, np, nd, and nf (n6) states in neutral lithium are evaluated within the framework of relativistic many-body theory. First-, second-, third-, and all-order Coulomb energies and first- and second-order Breit corrections to energies are calculated. All-order calculations of reduced matrix elements, oscillator strengths, transition rates, and lifetimes are given for levels up to n=4. Electric-dipole (2snp), electric-quadrupole (2snd), and electric-octupole (2snf), matrix elements are evaluated to obtain the corresponding ground-state multipole polarizabilities using the sum-over-states approach. Scalar and tensor polarizabilities for the 2p1/2 and 2p3/2 states are also calculated. Magnetic-dipole hyperfine constants A are determined for low-lying levels up to n=4. The quadratic Stark shift for the (F=2M=0)(F=1M=0) ground-state hyperfine transition is found to be 0.0582Hz/(kV/cm)2, in slight disagreement with the experimental value 0.061±0.002Hz/(kV/cm)2. Matrix elements used in evaluating polarizabilities, hyperfine constants, and the quadratic Stark shift are obtained using the all-order method.

  • Received 28 December 2007

DOI:https://doi.org/10.1103/PhysRevA.77.022510

©2008 American Physical Society

Authors & Affiliations

W. R. Johnson*

  • Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA

U. I. Safronova

  • Physics Department, University of Nevada, Reno, Nevada 89557, USA

A. Derevianko

  • Physics Department, University of Nevada, Reno, Nevada 89557, USA

M. S. Safronova§

  • Department of Physics and Astronomy, 217 Sharp Lab, University of Delaware, Newark, Delaware 19716, USA

  • *johnson@nd.edu
  • On leave from ISAN, Troitsk, Russia. usafrono@nd.edu
  • andrei@unr.edu
  • §msafrono@udel.edu

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Issue

Vol. 77, Iss. 2 — February 2008

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