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The photolysis of acetone in the presence of methyl alcohol and of methyl-d3 alcohol has been studied between 406 and 472° K. The rates and Arrhenius parameters for the following abstraction reactions have been determined:[Formula: see text] [Formula: see text] [Formula: see text]At 182 °C the rate of reaction [b] is found to be approximately four times greater than the rate of reaction [c].

A pulsed ion source has been constructed for use with a magnetic-deflection mass spectrometer. With this source the time between ion formation and withdrawal for analysis can be controlled and varied in a know11 manner. The design and operating characteristics of the source are discussed and a technique is described for the measurement of ion withdrawal times using the pulsing technique.The rate constant for the ion molecule reactionhas been determined for the reaction of thermal energy ions using reaction time as the experimental variable. The equivalent reactions in the deuteriomethanes have also been studied. Preliminary results obtained in the study of the uni~nolecular fragmentation of the cyclohexadiene, toluene, and spiroheptadiene parent ions are presented.