Abstract
The inhibiting effects of benzene and of 1,3-cyclohexadiene (CHD) on the formation of hydrogen during the radiolysis of methylcyclopentane (MCP) have been analyzed according to the nonhomogeneous kinetics of charge scavenging. The results are consistent with the following suggestions: CHD is an efficient scavenger of electrons; benzene is not an efficient scavenger of electrons but it may scavenge positive ions. These reactions offer alternatives to the hydrogen atom scavenging mechanism that has often been postulated in the past. They can decrease the hydrogen yield from MCP by 20 g units (based upon the energy absorbed only in MCP). In addition to the above scavenging mechanisms, which occur at relatively low solute concentrations (~ 1 mole %), benzene and CHD can each take part in a less efficient hydrogen inhibition reaction that can decrease g(H2) by another 1.6 units. This confirms the earlier suggestion (J. Chem. Phys. 33, 71 (I960)) that two different, inhibitable hydrogen forming processes occur during the radiolysis of saturated hydrocarbons.The yields of other products are also reported.
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