Absolute rate of the reaction of atomic hydrogen with acetaldehyde

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) ×10−11 exp(−3300±120/1.987T) cm3 molecule−1 s−1. 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.