Radiative lifetimes and collisional deactivation rates of leves in the 4p^(4)5p configuration of singly ionized krypton

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Abstract
The radiative lifetimes of the levels of the Kr II 5p configuration have been measured by a transient-decay technique. Excitation is obtained with threshold-energy electrons. Decay rates were measured over the range of gas pressures, 0.02 to 1.0 torr, indicating a de-excitation cross section for collisions with the krypton background gas of ~ 10-14 Cm2 at 385°C. Lifetimes of the unperturbed 5p levels range from 7.7 to 10.2 ns; for the unperturbed 5p′levels the range is 6.0 to 8.9 ns. The error in the measured lifetimes is estimated to be less than 5%. The lifetimes are generally found to agree with intermediate-coupling calculations within 20%. They are also compared with recent beam-foil measurements.