M1 transition rates from electron beam ion trap and heavy-ion storage ring

Abstract

The transition probability of the magnetic dipole (M1) transition 2s22p 2PoJ=1/2 to J′=3/2 (λ=574.19 nm) in the B-like ion Cl12+ has been measured using two different light sources, the Heidelberg heavy-ion storage ring TSR and the Livermore electron beam ion trap EBIT-I. Our results for the atomic level lifetime are (21.2±0.6) ms from the heavy-ion storage ring and (21.0±0.5) ms from the electron beam ion trap. Particular attention has been paid to systematic errors, using these measurements as well as recent measurements on Fe10+ and Fe13+ ions as examples.