Ionization Potentials of Free Radicals Formed by Electron Impact. Methylstannyl Radicals

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Abstract
The vertical ionization potentials of the (CH3)3Sn, (CH3)2Sn, and CH3Sn radicals have been measured using a double-pulsed mass-spectrometric method in which the radicals were formed by the impact of electrons on hexamethylditin. As a check on the internal consistency of the method and measurements, the vertical ionization potentials of several alkyl radicals, R, produced by electron impact on compounds of the type (CH3)3Sn–R, were measured. The values found were generally somewhat higher than recent measurements using photoionization and pseudomonoenergetic electron-impact methods, but were in excellent agreement with the vertical ionization potentials obtained by the impact of nonmonoenergetic electrons on thermally-produced alkyl radicals.