Abstract
Third-order many-body perturbation theory is used to obtainE1 transition amplitudes for ions of the lithium and sodium isoelectronic sequences and for the neutral alkali-metal atoms potassium, rubidium, cesium, and francium. Complete angular reductions of the first-, second-, and third-order amplitudes are given. Tables of transition energies and rates are given for the 2p1/2→ 2s1/2, 2p3/2→ 2s1/2, 3s1/2→ 2p1/2, and 3s1/2→ 2p3/2transitions in the lithium isoelectronic sequence and for the corresponding 3p1/2→ 3s1/2, 3p3/2→ 3s1/2, 4s1/2→ 3p1/2, and 4s1/2→ 3p3/2transitions in the sodium sequence. For neutral alkali atoms, amplitudes ofnp1/2→ ns1/2,np3/2→ ns1/2, (n+ 1)s1/2→ np1/2, and (n+ 1)s1/2→ np3/2transitions are evaluated, wherenis the principal quantum number of the valence electron in the atomic ground state. Semi-empirical corrections for the omitted fourth- and higher-order terms in perturbation theory are given for the neutral alkali-metal atoms. Comparisons with previous high-precision calculations and with experiment are made.
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