1996 Articles

Laboratory Measurements of Fe XXIV L-Shell Line Emission

Savin, Daniel Wolf; Beiersdorfer, P.; Lopez-Urrutia, J. Crespo; Decaux, V.; Gullikson, E. M.; Kahn, S. M.; Liedahl, D. A.; Reed, K. J.; Widmann, K.

Recent ASCA spectra exhibit discrepancies with the relative line intensities of various Fe XXIII and XXIV L-shell emission lines predicted by standard plasma emission codes. To address this issue, we have carried out a series of high-resolution, broadband measurements of Fe XXIV line emission using an electron beam ion trap facility. X-ray lines produced in the trap are detected and resolved using Bragg crystal spectrometers. We report measurements of 3 → 2 and 4 → 2 transitions, which result primarily from electron impact excitation. Overall, good agreement is found with distorted wave calculations.