Figure 2

(Left column) Abel-inverted iodine images measured in femtosecond pump-probe VMI experiments for selected linear and branched alkyl iodides following excitation at ~201 nm (pump, see Fig. 1). Both I and I* fragments are detected by (2 + 1) REMPI using a probe laser pulse centered at 304.5 nm. The time delay is fixed at 10 ps. In the images, the radius is proportional to the translational energy of the iodine fragment. The polarization of the pump and probe lasers is vertical. (Right column) Center-of-mass (CM) total translational energy distributions for the different alkyl iodides obtained from the angular integration of the corresponding inverted images are depicted in the right column. The solid vertical lines correspond to the available energy for the I* channel, according to the known dissociation energies of the different molecules indicated in Table 1.