The -ray and electron pulse irradiation of aqueous methane and some ethane solutions is reported. The absorption spectra of the CH3 and C2H5 free radicals have been measured in the wavelength range 210-270 nm. At 210 nm e(CH3) = 850 M-1 cm-1 and e(C2Hs) = 520 M-1 cm-1. The bimolecular recombination rate constants are 1.24 ± 0.2 x 109 and 0.96 ± 0.2 X 109 M-1 sec-1 for CH3 and C2H5, respectively. The rate constant fe(OH + CH4) = 1.21 ± 0.4 X 108 M-1 sec-1; k(CHa + H202) = 3.5 X 107 M-1 sec-1. The yields G(-CH4), G(C2H6), G(H2), G(H2Ó2), and G(N2) for N20-CH4 solutions are reported for some acid, neutral, and alkaline solutions. A radiolysis mechanism is also given. menta fe(CH4 + OH) has been established as 1.4 x 108 M-1 sec-1.7 As expected, CH3 is the product radical and its re-(1) Work performed under the auspices of the U.S. Atomic Energy Commission.(2) G. G. Meisels in "Fundamental Processes in Radiation Chemistry." P.

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