A number of cyanocarbons and related compounds have been studied by the magnetron technique and observed to capture electrons directly. These molecules have electron amities in the range 1 -3 3 eV and show evidence for an additive relationship between the number of CN subsituents and the electron affinity. The measured electron affinities are related to the energy of the charge-transfer band in charge-transfer complexes with pyrene and to the reversible one electron-polarographic reduction potentials. The electron affinities measured are related to the work done in bringing the electron up to the molecule against the external field of the dipolar substituents.

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A steady-state flowing afterglow has been utilized to measure the rate coefficients for the following reactions :H e b + N 2 -+ N + ; N i ; H e . He++02 +O+ ; 0; ; He.N i 40,+02+ ; N2.The data have been analyzed both with regard to the decay of the parent ion and the changing ratio of the product to parent ion with increasing reactant addition or reaction time. The experimental conditions have been varied over a limited range of pressures and flow velocities in order to minimize any systematic errors associated with a single method of data analysis. The resulting rate coefficients are consistent and agree well with previous estimates for these reactions.N++OZ +NO+; 0; ; N.The use of flowing afterglows for the study of ion-molecule reactions has been pioneered by Ferguson et aZ.l who have utilized them to study a large number of reactions.2 Several different methods of data analysis for flowing afterglow experiments, each depending upon slightly different approximations, necessary for the solution of the continuity equations for the various ions in the plasma, are presented here. The agreement or otherwise of these calculations provides useful insight into the accuracy of, or systematic errors inherent in, the measured rate coefficients.

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A number of quinones have been studied by the magnetron technique of which only benzoquinone and chloranil have been observed to capture electrons directly. The measured electron affinities at 0°K were 31.7+ 1.9 kcal!mole and 56.6C5.9 kcal/mole respectively. The other quinones which have been studied show evidence for ion formation by dissociative processes and in some cases it is possible to infer the energy of the bond broken.