The lifetime of 4p54d levels in highly ionized atoms
G. Gaigalas, P. Rynkun, Charlotte F. Fischer
Energy levels, lifetimes, and wave function compositions have been computed for all atomic states of the 4p6 and 4p54d configurations using a single-reference (SR) configuration state along with single- and double-substitutions (SD) to generate expansions for the multiconfiguration Dirac- Hartree-Fock (MCDHF) approximation. Lifetimes are computed from E1, E2, and M1 transitions between these levels. Energy levels and transition energies (or wavelengths) are compared with other theory and experiment, when available. Some E1 transition data and the convergence of length and velocity forms of the line strength are reported. Transition data for 4p6 1S0 - 4p54d J = 1 transitions are investigated in detail. By classifying the upper states by J, parity (), and position (POS), the compositions of the states with the same three quantum number change smoothly as a function of the nuclear charge Z and transition energies and transition matrix elements can be approximated by polynomial expressions in Z. A zero in the transition matrix element for the 1S0− 3 P1 transition leads to a long life-time at Z 58. Transition data for E2, M1 transitions among levels of 4s24p54d are reported as Supplemental Material.
, Rynkun, P.
and Fischer, C.
The lifetime of 4p54d levels in highly ionized atoms, Physical Review, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917546
(Accessed June 9, 2023)