The scavenging of e~ in A-methylpyrrolidinone(NMP) has been studied using methyl bromide, £raws-stilbene and biphenyl as solutes. The rate constants for reaction of e-with these solutes at room tem pera ture (20 + 2 °C) are (1.83 + 0.11) x 1010, (2.40 + 0.2) x 1010 and (2.09 + 0.03) x 1010 dm 3 * * * * * * mol-1 s-1, respectively. Yields of methane ob tained from y-irradiated solutions of methyl bromide increased from 6r(CH4) = 130 nmol J -1 for [CH3Br] = 1.6 x 10-4 mol dm -3 to G(CH4) « 400

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... l J -1 for [CH3Br] = 0.56 mol dm -3. Treatm ent of the d ata by the W arm an-Asm us-Schuler equation indicated th a t the yield of e-escaping the spurs, 6r(e") is 102 + 8 nmol J -1 and th a t the total ionization yield, G(e-)tot is 432 + 30 nmol J -1. Yields of stilbene (St-*) anion observed on pulse radiolysis of tfraws-stilbene ( t -S t) solutions nmol J -1 in fair agreement with the value estimated from the CH3Br data. Except a t the highest [f-St] the yields of S t-' were independent of the pulse length in the range 10-200 ns, but the yield of St-' approximately doubled as [+St] increased from 10-4 to 0.5 mol dm -3. The yields of biphenyl anion measured a t the end of 25 ns pulses followed the same pattern as the S t-' yields, but the increase was only about 55 % over a similar concentration range.