LABORATORY MEASUREMENTS OF FE-XXIV L-SHELL LINE EMISSION

Recent ASCA spectra exhibit discrepancies with the relative line inten sities of various Fe XXIII and XXIV L-shell emission lines predicted b y standard plasma emission codes. To address this issue, we have carri ed out a series of high-resolution, broadband measurements of Fe XXIV line emission using an electron beam ion trap facility. X-ray lines pr oduced in the trap are detected and resolved using Bragg crystal spect rometers. We report measurements of 3 --> 2 and 4 --> 2 transitions, w hich result primarily from electron impact excitation. Overall, good a greement is found with distorted wave calculations.