Collisions of Fe⁺ ions, clusters and hydroxides ligated by water molecules

Abstract

A laser evaporation source has been used to generate a beam of Fe⁺, FeOH⁺, Fe(OH)₂⁺, FeH⁺, Fe₂⁺ and Fe₃⁺ ions solvated by up to 11 water molecules, with the major series of ions corresponding to Fe(H₂O)_n⁺ clusters. These ions were collided, prior to mass selection, with Ar, N₂, O₂ or CH₃OH, and apparent scattering cross-sections were measured. Simple collision models, coupled with a Monte Carlo simulation of the scattering experiment, were used to account quantitatively for the observations. The most striking result is that only methanol exchanges with a cluster water molecule, although this is a minor channel. There is inelastic scattering with argon but the other collisions are mainly elastic.

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