Photodissociation and Size Analysis of (HBr)_n Clusters

摘要

Hydrogen bromide clusters that are generated in an adiabatic expansion with Ar are size-selected by scattering from a He or a Ne beam and a subsequent separation by a velocity selector. The complete fragmentation pattern for electron impact ionization of clusters n = 3, 5, 7, 10, and 15 is obtained for electron energies of 70 eV. Up to cluster sizes of n = 15 strong fragmentation is observed. Based on these results the cluster sizes are measured as a function of different source conditions.