The first measurements of high-energy x-ray emission (hν~30-300 keV) by high-Z microballoon targets irradiated at 5×10¹⁴<φ<2×10¹⁶ W/cm² by 10.6-{μ}m laser light are reported. An exponential spectrum with a slope kTH~250 keV provides the best fit to spectrometer data at φₗ=10¹⁶ W/cm². The hard-x-ray yield indicates that a substantial fraction, probably between 10% and 100%, of the absorbed laser energy is converted to hot electrons. The slope kTH is proportional to the fastest ion energy.
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Priedhorsky et al. (1981) studied this question.
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