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Quantification of a Radical Beam Source for Methyl Radicals

A radical beam source for methyl radicals (CH3) was characterized applying ionization-threshold mass spectrometry. The beam source is based on thermal dissociation of methane (CH4) or azomethane (N2~CH3!2! in a heated tungsten capillary. A flux of (361)31013 cm22 s21 CH3 radicals is produced using methane as precursor gas and a capillary temperature of 1650 K.