The probabilities of radiative transitions and lifetimes of levels in the spectra of Cu XX, La IV

Abstract

The probabilities of radiative electric dipole transitions 2p⁵3p, 2p⁶–2p⁵3s, and 2p⁵3d in the spectrum of neon-like copper Cu XX and 5p⁵6p, 5p⁶–5p⁵6s, 5p⁵7s, and 5p⁵5d in the spectrum of xenon-like lanthanum La IV are calculated. The wave functions of the intermediate coupling were found from the wellknown experimental energy levels by the least-squares method (LSM). To transfer to an absolute scale the radial integrals for the transitions calculated in the form of a length on the Hartree–Fock functions have been used. By summing the calculated probabilities of the transitions, the lifetimes of the levels of configurations 2p⁵3s, 2p⁵3p, and 2p⁵3d in the spectrum of Cu XX and levels of configurations 5p⁵6s, 5p⁵6p, and 5p⁵7s in the spectrum of La IV have been obtained.