Abstract
DURING an investigation into the kinetics of the O+C2H2 reaction in a flow system by electron spin resonance (ESR) spectroscopy (unpublished results of J. N. B. and R. S. T.) an intense signal with an effective g value of 2.00 was detected. The following evidence showed that it was the result of cyclotron resonance of free electrons. The signal appeared with a TE012 cavity, with electric lines of force perpendicular to the d.c. magnetic field, but not with a cavity operating in the TE102 mode. The application of a d.c. potential to tungsten electrodes inserted upstream of the cavity reduced the signal and produced a measurable current but did not affect the ESR signals. The signal was up to 107 times more intense than that of the normal radical electric dipole transition and was characteristically broad and unsymmetrical with a g value of 2.00 (refs. 1 and 2). The signal versus reaction time profile was similar in shape to those reported3 for the system using Langmuir probe and mass spectrometer detection.
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