Abstract
A comprehensive investigation of the high-energy [(70--400)-keV] x-ray emission from ${\mathrm{CO}}_{2}$-laser-produced plasmas at intensities up to 3\ifmmode\times\else\texttimes\fi{}${10}^{14}$ W/${\mathrm{cm}}^{2}$ has revealed the presence of a ``superhot'' component. The intensity of this component scales very strongly with incident laser intensity. It is expected that for intensities ?5\ifmmode\times\else\texttimes\fi{}${10}^{15}$ W/${\mathrm{cm}}^{2}$ energy balance in ${\mathrm{CO}}_{2}$-laser-produced plasmas would be dominated by the energetic electrons responsible for this high-energy x-ray emission.
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