The additions of small amounts of methanol, ethanol, cyclohexane and ether to water vapour at 116°C result in large values of G(H2) when subjected to 7-irradiation. G(H2) increases at first with increase of additive concentration, but in each case ultimately reaches a constant value within the range G(H2) = 8.0f0-7. It is concluded that this is the value of GH from water vapour in these conditions. The effect of oxygen on the methanoI+water vapour system is to decrease G(H2) and increase G(CH20). The latter has a value 8.5 at high oxygen concentration and is a measure of GOH. The G(H2) from pure methanol vapour and pure ether vapour at 116°C are found to be 11.8 and 6-7 respectively.
Nitrous oxide at low concentrations reduces the high yield of hydrogen from y-irradiated water vapor containing methanol from 8.9 per 100 electron volts absorbed to a plateau value of 5.9. This indicates that both electrons (yield 3.0) and hydrogen atoms (yield 5.4) are precursors to the hydrogen, the former being scavenged by nitrous oxide.The high yield of hydrogen, G(H2), produced when various additives are present during the y-irradiation of water vapor has been interpreted (1) in terms of reactions of H atoms:
Nitrous oxide at low concentrations reduces the high yield of hydrogen from γ-irradiated water vapor containing methanol from 8.9 per 100 electron volts absorbed to a plateau value of 5.9. This indicates that both electrons (yield 3.0) and hydrogen atoms (yield 5.4) are precursors to the hydrogen, the former being scavenged by nitrous oxide.
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