Monte Carlo simulations are used to calculate the primary radical yields gðe aq À Þ, g( OH), the sum [gðe aq À Þ + g( OH) + g(H )], and the ratio g(H )/gðe aq À Þ in the low linear energy transfer (LET) radiolysis of supercritical water (SCW) at 400 8C in the high-density, liquid-like region near *0.5 g/cm 3 . Using all the currently available information on the reactivities and diffusion coefficients of the radiation-induced species under these conditions, and assuming the aqueous medium to be a ''continuum'', a good accord is found between our calculations and the available experimental data. In particular, our computed e aq À yields at 60 ps and 1 ns compare very well with recently reported direct time-dependent e aq À yield measurements in SCW (D 2 O) at 400 8C and 0.570 g/cm 3 using picosecond pulse radiolysis experiments.
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