Abstract

By setting an appropriate condition for the gas evaporation of silver, two vertically well separated zones-a transparent emission zone and a bright smoky zone-have been produced above the evaporation source in a confined helium atmosphere. Optical data were obtained by measuring time-resolved and space-resolved transmissivity spectra. The structure of the spectra and their dependence on time on the one hand and on the distance from the source on the other hand support the occurrence of atoms, clusters and microcrystals. The mechanism of the growth of silver clusters and microcrystals by the gas evaporation technique is also studied.

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