Fluorescence in Mg ix emission at 48.340 Å from Mg pinch plasmas photopumped by Al xromani line radiation at 48.338 Å

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Abstract
Resonant photopumping of Be-like Mg i x ions by Li-like Al x i line radiation has been studied in pulsed-power-driven plasmas as a possible approach to achieve laser action in the extreme-ultraviolet wavelength region. An Al x-pinch or z-pinch plasma imploded by a 0.5-TW pulsed power generator produced intense line radiation at 48.338 Å. A separate Mg z-pinch plasma, driven by the same pulsed power generator, was created in parallel with 1 cm separating the two plasmas. Evidence for fluorescence (resonant scattering) was the appearance of 48.340-Å resonance line emission from the 4p level of Mg i x ions due to photopumping by the Al x i line radiation at 48.338 Å. Fluorescence may also have been observed on the Mg viii line at 52.395 Å, photopumped by Al x i line radiation at 52.446 Å. Both Al and Mg plasmas were characterized in the experiments. Improvements to the pump geometry required to achieve gain on the Mg i x line at 228 Å are also discussed.