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The radical H 2 C -CO -CH 3  was produced in an acetone/H 2 O/H 2 O 2  solution by photolysis using techniques similar to those developed by LIVINGSTON and ZELDES. The temperature dependence of the ESR spectrum indicates restricted rotation of the CH 2 -group relative to the rest of the molecule. A complete line-shape analysis of the spectrum at various temperatures leads to Arrhenius-para-meters E a = (9.4 ± 0.5) kcal/mol and  10 log k 0  = 12.9 ± 0.3 which can be interpreted in the frame of the simple HMO theory.

ESR-Untersuchung der behinderten Rotation der CH 2 -Gruppe im photolytisch erzeugten H 2 C — CO — CH 3 -Radikal