Mass spectrometric analysis of the neutral products in a C2H4 microwave plasma: carbon carbenes and aromatic compounds

Mass Spectrometry of Free Radicals

“…However, no gaseous products containing more than two carbon atoms were detected . On the contrary, identification of an unfamiliar neutral species, carbon carbenes up to C 9 H 2 , and hydrocarbon polymer radicals, C n H 3 • , C n H 5 • , C n H 7 • , was reported by Fujii and Kim using Li + IAMS to probe a microwave discharge in pure ethylene. Larger hydrocarbon compounds are thought to result from the initial formation of ethyl radicals through ethylene dissociation reaction, followed by successive condensation reactions of this radical with other hydrocarbon compounds.…”

“…The formation of higher carbene compounds are accounted for by the formation of a linear cumulene backbone with successive additions of carbon atoms with acetylene as a neutral intermediate species. The observation of C 4 H 3 • suggested either the reaction of acetylene with an ethynyl radical or the abstraction reaction of molecular hydrogen with acetylene by a vinyl radical to explain its presence …”

3 Mass spectrometry of free radicals: a methodological overview

“…As a continuation of earlier CH 4 studies on the detection of gaseous HC radicals, the identification of neutral radical species in a C 2 H 4 (MW) discharge flow tube is reported. 112 The microwave discharge is an important process for the production of novel compounds. Although applications of the discharge are of growing technological importance, the processes that occur in the discharge are poorly understood.…”

Mass Spectrometric Characterization of the Partial Oxidation Process of a Gasoline Surrogate Induced by a Dielectric Barrier Discharge

“…IAMS achieves the ionization of gaseous organic compounds, including saturated hydrocarbons. In addition, IAMS is used for the detection of the intermediates in hydrocarbons − and fluorocarbon microwave plasmas and combustion flames because the frangible compounds can be ionized by IAMS without fragmentation. We have previously investigated the SDBD-induced partial oxidations of isooctane ( i -C 8 H 18 ) and n -heptane ( n -C 7 H 16 ), which are constituents of the five-component gasoline surrogate, S5R, and the detection of the ketones and aldehydes generated by SDBD in a lean hydrocarbon/air mixture is achieved by IAMS .…”