Promotion by SF6 of a Radiolytically Induced Chain Reaction for the Geometrical Isomerization of cis or trans-Butene-2 in Dilute Gaseous Mixtures
FOR several years SF6 has been used in radiolytic studies because of its high cross-section for capture of low-energy electrons and consequent effect on observable products resulting from positive-ion neutralization reactions. A reduced yield of H2 from irradiated propane has been reported1 and attributed to electron scavenging by the small proportions of SF6 present. On the other hand, SF6 does not affect the H2 yield from irradiated liquid unsaturates such as trans-butene-2 (ref. 2), indicating that ionic species may not be important with respect to H2 formation from these olefines.
SF6 added to irradiated gaseous ethylene acts not only as an electron scavenger
Abstract The reduction in the yields of C 4 unsaturated hydrocarbons from C 2 H 4 NH 3 mixtures in the presence of SF 6 is due to secondary processes involving a radical derived from SF 6 .
Reactions of Electrons in the γ-Radiolysis of Liquid Alkanes
THE radiation chemistry of liquid alkanes (for example, cyclohexane, n-hexane) has been investigated extensively1. In particular, it has been shown that the addition of small amounts of certain substances, such as iodine or carbon tetrachloride, causes large changes in product yields. This ‘protective’ effect has been the subject of much discussion since it has an important bearing on the nature of the radiation-produced primary species. ‘Energy transfer’, free radical processes2–5 and scavenging of electrons6,7 have all been proposed.