Measurements of electron energy distributions from ultraintense (>1019 W/cm2) laser solid interactions using an electron spectrometer are presented. The effective hot electron temperatures (Thot) have been measured for laser intensities (Iλ2) from 1018 to 1021 W/cm2 μm2 for the first time, and Thot is found to increase as (Iλ2)0.34±0.04. This scaling agrees well with the empirical scaling published by Beg et al. [Phys. Plasmas 4, 447 (1997)], and was modeled by particle-in-cell simulations.
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