Temporally resolved x-ray spectra in the range of 1-20 keV have been obtained from laser-irradiated high-Z disk targets. We obtain the first time-resolved direct observation of the suprathermal x-ray tail resulting from hot-electron generation due to collective processes. The measurements indicated that the suprathermal temperature θH has a temporal behavior which essentially follows the laser pulse of intensity I, implying a relation θH~Iⁿ, n1, an unexpected result.
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Lee et al. (1979) studied this question.
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