Dissociation dynamics of gauche and anti conformations of 1-iodopropane ions prepared selectively by vacuum–ultraviolet mass-analyzed threshold ionization spectrometry: Photodissociation at 426 and 355 nm

Mass-analyzed threshold ionization with coherent vacuum ultraviolet radiation was used to generate the gauche, or alternatively anti, ion beam of 1-iodopropane ion. Conformation-selective photodissociation of these ion beams was studied at 426 and 355 nm which correspond to excitation to the second and third electronic states appearing in the photoelectron spectrum, respectively, and compared with dissociation in the first excited state reported previously. Conformation-specificity was not observed at 426 and 355 nm unlike the dissociation in the first excited state. Plausible mechanisms for dissociations from the excited electronic states are discussed based on the presence/absence of conformation-specificity, dissociation anisotropy, and kinetic energy release.