X-ray spectra and conversion efficiencies of the laser-produced chlorine Ly-alpha and K-alpha line radiation have been investigated to develop X-ray probes for the collective scattering regime. The Ly-alpha radiation was produced by either smoothed or un-smoothed laser beams with nanosecond-long laser pulses yielding high conversion efficiencies of up to 0.3 sufficient for X-ray scattering measurements. However, the time-integrated measurements show a significant dielectronic satellite emission on the red wing of the primary Ly-alpha line which must be avoided to resolve the plasmon feature in the scattering spectra. We find no red wing emission features for ultra-short pulse laser produced K-alpha radiation. The bandwidth of Delta E/E = 2 x 10(-3) is suited for collective scattering, but the conversion efficiency falls short of the high values achieved for the Ly-alpha. These findings indicate that present laser-produced X-ray sources will restrict the choice of detectors and plasma conditions for collective X-ray scattering from dense plasmas. Published by Elsevier Ltd.
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