VUV photoionization and dissociative photoionization of o-xylene: experimental and theoretical insights

The photoionization and dissociative photoionization of o-xylene have been studied using synchrotron radiation vacuum ultraviolet light with the photon energy in the range of 8.0-13.0 eV. The ionization energy of o-xylene and the appearance energies for the main fragment ions C8H9+, C7H7+ and C6H6+ were determined to be 8.45, 11.08, 11.47 and 11.17 eV, respectively, with photoionization efficiency spectra (PIES). Three dissociation pathways of parent ions are investigated by experimental photoionization and the quantum-chemical calculations. The fragment ions C7H7+ derived from parent ions involved hydrogen atom transfer rather than direct dissociation. Particularly, detailed mechanisms of dissociation C6H6+ are presented for the first time in this work. In addition, the geometries of the intermediates (INTs), transition states (TSs) and products have been performed at B3LYP/6-311 ++ G (d, p) level. The mechanisms of dissociative photoionization of o-xylene and the INTs and TSs involved are discussed in detail.

Automated summary

The photoionization and dissociative photoionization of o-xylene were studied using synchrotron radiation vacuum ultraviolet light. The ionization energy and appearance energies of fragment ions were determined, with a detailed mechanism presented for C6H6+ dissociation. Geometries of intermediates, transition states, and products were performed, with discussions on the mechanisms involved.