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Using the beam-foil method we have determined the lifetimes of the nd 2 D ( n = 4–6) and 4 s 5 s 4 D levels in Cu I and of the 4 p 3 D , 3 F , 4 f 3 H and 5 s 3 D levels in Cu II. Special emphasis was placed on the problems of measuring comparatively long lifetimes in heavy atoms with the beam-foil excitation method and corrections of systematic errors were investigated. The final data are in agreement with theoretical values, based on the Coulomb approximation.
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Cederquist et al. (1984) studied this question.
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