Appearance energies for [ C7H7]+ and [ C,H,I+ fragment ions obtained from methylphenol isomers were measured at the threshold using the electron impact technique. Different processes for the formation of the ions are suggested and discussed. Metastable peaks were detected and the kinetic energies released were determined. The results indicate that [ C7H,]+ ions are formed from methylphenols with both benzyl and tropylium structures, whereas [ C,H,]+ ions are formed with the phenyl structure at the detected thresholds. Kinetic energies released on fragmentation of reactive I C,H7]+ and I CHsl' ions were used as a probe for the structure of the ions at 70 eV.
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