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The performance of a new pulsed arc cluster ion source (PACIS) is demonstrated for pure metal cluster ions and anions as well as mixed metal-rare-gas clusters. Pure metal clusters like W$ exhibit intensity distributions similar to those from laser vaporization sources. The ion current of the PACIS is comparable to that of a laser vaporization source. For metal-doped argon cluster ions, a single aluminium atom serves as the central ion which is surrounded by argon atoms arranged in an icosahedron. These measurements therefore strongly support the close packing model for argon clusters.

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