Abstract
The hydrogen atom velocity distributions obtained from the one- and multi-photon dissociation processes in acrolein following excitation at 193nm were measured. The one-photon H-atom signal was found to be dominated by primary C-H bond fission in acrolein. The qualitative features of the recoil translational energy distribution for the observed H atoms were compared with the results obtained from the aldehydic C-H bond fission on the ground and lowest singlet and triplet excited states.