X-ray yields of M-shell emission from Xe clusters excited by Ti:sapphire (800 nm) and KrF (248 nm) laser pulses were compared under the same irradiation condition that was experimentally well characterized. Xe clusters were irradiated by 350-fs laser pulses of 20-mJ energy. For the KrF laser irradiation, the absolute x-ray yield in the wavelength region from 8 {} to 16 {} was estimated to be 38 μJ per pulse. The x-ray yield was 20 times higher than that for the Ti:sapphire laser irradiation. It was found that the x-ray yield from clusters in the keV region depends on the pump laser wavelength.
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Honda et al. (2000) studied this question.
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