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Lifetime of the 4s4p 3P1o level in foil-excited Zn-like Mo12+ and Ag17+ ions

Spectra of 19 MeV Ag ions after foil excitation have been recorded at the foil and at various distances from the foil. The spectra show a multitude of long-lived decays. A decay curve of the only known long-lived transition, the intercombination line 4s2 1S0-4s4p 3P1o in Zn-like Ag17+, yields a lifetime of τ = (1.18 ± 0.08) ns which compares well with results from a MCRRPA calculation. A similar measurement on Mo12+ yields τ = (4.5 ± 0.3) ns.