A 4D wave packet study of the CH3I photodissociation in the A-band. Comparison with femtosecond velocity map imaging experiments J. Chem. Phys. 135, 154306 (2011); 10.1063/1.3650718 Conformer specific dissociation dynamics of iodocyclohexane studied by velocity map imaging J. Chem. Phys. 135, 094312 (2011); 10.1063/1.3628682Determining the CH 3 SO 2 → CH 3 + SO 2 barrier from methylsulfonyl chloride photodissociation at 193 nm using velocity map imagingIn this study we demonstrate that it is possible to perform velocity mapping and slice imaging of charged particle products using a single field ͑two electrodes͒ improving on the multielectrode geometries of the past. The performance of this new geometry is competitive to the multielectrode ones, presently limited by detector "spot" resolution. For imaging both photoelectrons and photofragments a resolution of ϳ1% in velocity is achieved without further software manipulation such as event counting. The advantages of this new design are its ability to focus large volumes, its achromaticity ͑very little sensitivity on photofragment velocities͒, independence of the laser beam position in the field perpendicular to the extraction field, and compactness. Using this new design we have studied the photodissociation dynamics of pyrrole at 243 nm and show that internal conversion of electronically excited state molecules to the ground state is important even at such low excitation energies.

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