Experimental M1 Transition Rates of Coronal Lines from AR X, AR XIV, and AR XV

Details Experimental M1 Transition Rates of Coronal Lines from AR X, AR XIV, and AR XV Experimental M1 Transition Rates of Coronal Lines from AR X, AR XIV, and AR XV

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...541..506t&link_type=abstract

The Astrophysical Journal, Volume 541, Issue 1, pp. 506-511.

Astronomy and Astrophysics

Astronomy

31

Atomic Data, Methods: Laboratory

Scientific paper

Transition probabilities of three magnetic dipole (M1) transitions in multiply charged ions of Ar have been measured using the Livermore electron-beam ion trap. Two of the transitions are in the ground configurations of Ar XIV (B-like) and Ar IX (F-like), and are associated with the coronal lines at 4412.4 and 5533.4 Å, respectively. The third is in the excited 2s2p configuration of Be-like Ar XV and produces the coronal line at 5943.73 Å. Our results for the three atomic level lifetimes are 9.32+/-0.12 ms for the Ar X 2s22p5 2Po1/2 level, 9.70+/-0.15 ms for the Ar XIV 2s22p 2Po3/2 level, and 15.0+/-0.8 ms for the Ar XV 2s2p 3Po2 level. These results differ significantly from earlier measurements and are the most accurate ones to date.

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