Abstract
The growth of evaporated gold deposits on vacuum-cleaved sodium chloride substrates at 10 -6 torr and 200 °C has been studied. At the stage when the deposit consists of discrete islands it is found that many multiply-twinned particles are present. The resulting anomalous 111 and 220 reflections from these particles have been considered in detail, and it is shown that they can lead to inaccuracies in dark-field methods of analysing the proportion of (111)-oriented material in mixed-orientation layers. The existence of multiply-oriented nuclei is deduced, and is considered in terms of nucleation theories. Electron bombardment during deposition of gold on vacuum-cleaved rocksalt increases the nucleation density and produces a single (001)-orientation deposit. Possible mechanisms for these effects are discussed, and it is tentatively concluded that the electron bombardment changes the nature of the substrate.
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