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Using frequency modulation (FM) spectroscopy singlet methylene radicals have been detected for the first time behind shock waves. The thermal decomposition of ketene served as source for metylene radicals at temperatures from 1905 to 2780 K and pressures around 450 mbar. For the unimolecular decomposition reaction, (1) CH 2 CO + M → CH 2  + CO + M, the rate constants obtained are:

Investigation of the Thermal Decomposition of Ketene and of the Reaction CH 2 + H 2 ⇔ CH 3 + H