The rates of several electric-dipole forbidden decays of 3p and 3d levels in Cl-, S-, P-and Si-like ions of Fe have been measured optically at a heavy-ion storage ring. In several cases, more than one decay contributes to a given decay curve, which complicates the analysis. The lifetime results, with a precision range from 0.6 to 20%, compare well with some theoretical predictions, but are more precise. They are also more precise than some experimental data from an electrostatic ion trap.
Lifetimes (the inverse of the total decay rates) of several 3p and 3d levels in Ca-,
Ar-, Cl- and Si-like ions of Fe that decay only by electric-dipole-forbidden
transitions have been measured optically using a heavy-ion storage ring, observing
either near-UV or EUV light. In several cases, more than one decay contributes to
a given decay curve, which complicates the analysis. The lifetime results, with a
precision ranging from 0.8 to 10%, compare well with some theoretical predictions.
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