Photoelectron–photofragment ion recoil vector correlations in the dissociative photoionization of PF3 at He i and Ne i ionizing wavelengths

Powis, Ivan
September 1993
Journal of Chemical Physics;9/1/1993, Vol. 99 Issue 5, p3436
Academic Journal
A comparative study of the photoionization and dissociation of the A state of PF3+ at two different resonance line ionizing wavelengths (He i and Ne i) is presented. Using a photoelectron–photoion coincidence (PEPICO) technique, energy selected ions are prepared and fragment ion kinetic energy distributions derived. The energetics and dynamics of the ion fragmentation process are discussed and a simple impulsive dissociation model is proposed. An angular correlation between the recoil directions of ejected electrons and fragment ions is identified and is especially pronounced for the He i data. An interpretation in terms of an anisotropic body-frame photoelectron angular distribution is presented, from which the likely presence of a shape resonance in the A state photoionization dynamics around λ=584 Å is inferred. This accords with the observation of resonances in core photoionization studies of PF3.


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