Absolute rate constants for the reaction of hydrogen atoms with acetaldehyde were obtained over the temperature range 298-500 K using the flash photolysis-resonance fluorescence technique. The rate constants gave the Arrhenius expression k = (2.23 ±0.39)X 10-11 exp( -3300± 120/ 1.987 T) cm 3 molecule-Is-I. Independent experiments with a discharge flow system employing resonance fluorescence detection of H gave a room temperature rate constant in agreement with this equation. These results are discussed and comparisons are made with previous work and theoretical predictions.
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