Abstract
Oscillator strengths f are calculated by the Dirac-Fock method for the resonance transitions of the first ten members of the cesium isoelectronic sequence. The change in the values of f along the isoelectronic sequence is considered. The corresponding transition probabilities and lifetimes τ of some excited levels are also calculated. The dependence of values of τ on the charge of an ion is approximated by an analytic expression. It is established that the lifetime of the \(6P_{1/2}^ \circ\) levels decreases along the isoelectronic sequence as τ ∼ zef−β, where zef is the ion core charge and β = 3.21. The calculated values of f and τ are compared with the experimental data.
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