Experimental Transition Rate of the Green Coronal Line of Fe<scp>xiv</scp>

Abstract

The transition probability of the electric dipole forbidden transition in the ground state of Fe XIV (Al-like), the "green coronal line" at 5302.86 Å, has been measured using the Livermore electron beam ion trap. Our result for the 3s23p2 2P atomic level lifetime is 16.74 ± 0.12 ms, which differs significantly from an earlier measurement, and is the most accurate one to date. The measured transition rate of 59.7 ± 0.4 s-1 corroborates some earlier calculations, but not all of the more recent ones.