Abstract
Measurements of the x-ray conversion efficiency (h\ensuremath{\nu}\ensuremath{\ge}100 eV) for a KrF-laser--produced plasma are reported. Planar targets with atomic numbers varying from 4 to 82 were irradiated by moderate intensities (${<10}^{13}$ W/${\mathrm{cm}}^{2}$) of 0.25-\ensuremath{\mu}m KrF-laser light and the resulting emission was observed by several detectors sensitive to x-ray photon energies from 100 eV to 15 keV. Most of the radiation appeared as xuv and was measured by x-ray diodes to obtain the conversion efficiency as well as the angular distribution of the emission. The x-ray emission both above and below 1 keV was found to display marked variation with atomic number, as successive atomic shells are ionized. These measurements are supplemented by spatial and temporal observations of the keV x-ray emission which also show variations with target atomic number.
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