Mass spectra are presented of clusters formed by quenching copper halide vapor in He gas. One peak in the mass spectrum corresponding to Cu14X+13is unusually strong. Total energy calculations using an ionic model indicate that this cluster is a cube with rock salt structure. We conclude that the copper halides which normally crystallize into the zinc blend structure prefer the NaCl structure in the early stages of growth. Onehyphen;photon ionization of small clusters was achieved using synchrotron radiation. By studying the wavelength dependence of the ionization efficiency and of the fragmentation, conclusions can be drawn concerning the energies of the Cuhyphen;dand halogenpelectrons. For the diatomic monomers the halogenpelectrons are most easily ionized. With increasing cluster size the energy of the Cuhyphen;delectrons moves toward the vacuum level resulting in reduced fragmentation of the cluster by loss of a halogen atom.
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