Scavenging of Radicals from the Gas Phase by Freezing with Dimethyl Disulfide. 2. Radicals from Discharges and a Flame of Acetylene

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Abstract
The method of detecting radicals from low‐pressure gas‐phase systems by scavenging with dimethyl disulfide (DMD) has been applied to microwave discharges in C2H2/He mixtures and to a C2H2/O2 flame. It was accomplished by condensing a supersonic nozzle beam from the reaction system together with a beam of DMD on a liquid‐N2 cooled surface. The scavenging products were measured by GC/MS after warming‐up. Radicals measured in the discharge were C2H, C4H, C6H, C3H2, C2 besides H atoms. Preliminary measurements on the flame showed that C6H5 (phenyl), CH2, C3H2, besides H and O atoms were prominent radicals at the end of the oxidation zone. The concentration of phenyl is of the same order as that of e.g. naphthalene. The method provides a means to distinguish condensible flame products from those that are formed during the sampling process when no scavenger is added.

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