THE CATALYTIC ROLE OF SMALL COINAGE-METAL CLUSTERS IN PHOTOGRAPHY

T. Leisner, Ch. Rosche, S. Wolf, F. Granzer and L. Wöste
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T. Leisner: Institut für Experimentalphysik, Freie Universität Berlin, Germany
Ch. Rosche: Institut für Angewandte Physik, Universität Frankfurt, Germany
S. Wolf: Institut für Experimentalphysik, Freie Universität Berlin, Germany
F. Granzer: Institut für Angewandte Physik, Universität Frankfurt, Germany
L. Wöste: Institut für Experimentalphysik, Freie Universität Berlin, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 1105-1108

Abstract: We model the generation of the photographic latent image in silver-halide systems by the deposition of size-selected silver and gold clusters onto silver-halide microcrystals. Coinage-metal cluster cations were produced in a sputtering arrangement, mass-selected by a quadrupole mass filter, and deposited with a well-controlled kinetic energy onto binderfree silver-bromide crystals. After exposure to the cluster beam, the samples were developed at a defined redox potential. The photographic action of the clusters was investigated as a function of their size, the coverage of the sample with clusters, the kinetic energy of the clusters during the deposition, and the redox potential of the developer. Development was observed after the deposition of${\rm{Ag}}_4^ + $or larger silver-cluster cations, and under some development conditions, after deposition of${\rm{Ag}}_3^ + $. No development was observed after the deposition of smaller silver clusters, and after the deposition of gold cluster cations${\rm{Au}}_n^ + $(n≤9).

Date: 1996
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DOI: 10.1142/S0218625X96001972

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