Abstract
Neutral CH3 radicals in a hollow cathode discharge cell containing methane have been detected with a quadrupole mass spectrometer, using the threshold ionization technique. With the experimental conditions employed in this work the measured efficiency in CH3 production has been 0.2%, which is higher than that shown for other types of discharges in the bibliography. On the other hand a high depletion of the CH4 density has been observed and the mass spectrum of the discharge shows the appearance of compounds at m=25, 26, and 27, proceeding from recombination processes.
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