Excitation energies, polarizabilities, multipole transition rates, and lifetimes in Th IV

Journal Article · Sun Oct 15 04:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.042511· OSTI ID:20857873

Safronova, U I; Johnson, W R; Safronova, M S ^[1]

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1. Physics Department, University of Nevada, Reno, Nevada 89557 (United States)

Excitation energies of the ns{sub 1/2} (n=7-10), np{sub j} (n=7-9), nd{sub j} (n=6-8), nf{sub j} (n=5-7), and ng{sub j} (n=5,6) states in Th IV are evaluated. First-, second-, third-, and all-order Coulomb energies and first- and second-order Coulomb-Breit energies are calculated. Reduced matrix elements, oscillator strengths, transition rates, and lifetimes are determined for the 96 possible nl{sub j}-n{sup '}l{sub j{sup ''}} electric-dipole transitions. Multipole matrix elements (7s{sub 1/2}-6d{sub j}, 7s{sub 1/2}-5f{sub j}, and 5f{sub 5/2}-5f{sub 7/2}) are evaluated to obtain the lifetimes of the 5f{sub 7/2} and 7s{sub 1/2} states. Matrix elements are calculated using both relativistic many-body perturbation theory, complete through third order, and a relativistic all-order method restricted to single and double excitations. Scalar and tensor polarizabilities for the 5f{sub 5/2} ground state in Th{sup 3+} are calculated using relativistic third-order and all-order methods. These calculations provide a theoretical benchmark for comparison with experiment and theory.

• OSTI ID: 20857873
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CATIONS
COMPARATIVE EVALUATIONS
CORRECTIONS
COULOMB ENERGY
E1-TRANSITIONS
ELECTRIC MOMENTS
EXCITATION
GROUND STATES
LIFETIME
MANY-BODY PROBLEM
MATRIX ELEMENTS
MULTICHARGED IONS
OSCILLATOR STRENGTHS
PERTURBATION THEORY
POLARIZABILITY
RELATIVISTIC RANGE
SCALARS
TENSORS
THORIUM IONS