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They specifically note an inability to detect free NH in the electric discharge through ammonia even at low pressure. Unfortunately, there does not appear to be any direct evidence of reaction or absence of reaction in the gas phase between NH radicals, i.e. NH + NH -> Nj + H2 (8) or between NH radical and some other molecule such as NH¡ or N2H4. Reaction 6 has a formal sim-M(?)ilarity to CH2 + H2 -> CH4, which appears to be rather well established.63•24 Reactions between NH and NH2 radicals are ruled out by the fact that the yields of N2 and N2H4(the products of the presumed reactions 2 and 5 or 8) are not interdependent (cf. section 4.1.7).The catalytic effect of platinum walls on hydrazine formation suggests the importance of a reaction which can interrupt the back reaction, 2 or 4, e.g., M

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