Measurement of the Radiative Decay Rate of the Metastable (2s 22p 5 3/23s 1/2)(J=2) Level in Fe XVII

Details Measurement of the Radiative Decay Rate of the Metastable (2s 22p 5 3/23s 1/2)(J=2) Level in Fe XVII Measurement of the Radiative Decay Rate of the Metastable (2s 22p 5 3/23s 1/2)(J=2) Level in Fe XVII

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...721..576c&link_type=abstract

The Astrophysical Journal, Volume 721, Issue 1, pp. 576-581 (2010).

Astronomy and Astrophysics

Astronomy

2

Atomic Data, Atomic Processes, Line: Formation, X-Rays: General

Scientific paper

The radiative decay rate of the (2s 22p 5 3/23s 1/2) J=2 → (2s 22p 6) J=0 transition was measured in Ne-like Fe XVII. This transition forms the prominent magnetic quadrupole line, dubbed M2 or 3H, in the Fe XVII spectrum at 17.10 Å. Different theoretical models predict radiative rates for this transition that diverge by almost a factor of 2, making intensity predictions for this line uncertain in environments where it is affected by de-excitation due to either electron-impact collisions or photoionization. Our result of (2.04+0.03 -0.09) × 105 s-1 is very close to the value of 2.06 × 105 s-1 predicted by the Flexible Atomic Code.

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