Observation of a Discrepancy between Experimentally Determined Atomic Lifetimes and Relativistic Predictions for Highly Ionized Members of the Na I Isoelectronic Sequence

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Abstract
The beam-foil technique has been used to record the intensity decay of the 3s−3p and 3p−3d transitions in Na-like Ti, Fe, Ni, and Cu. Subsequent analysis using the ANDC-CANDY cascade correction method results in lifetime data for the 3pP322 level which show a divergence from relativistic calculations as the nuclear charge increases. For the 3pP122 level, theory and experiment are found to be in better agreement.