Abstract
Small-particle-size colloids of red HgI/sub 2/ show relatively sharp blue-shifted optical absorption peaks in the UV that are attributed to size quantization effects. Within the framework of a simple model that only considers transitions between the lowest quantum states of electrons and holes in HgI/sub 2/, the optical data are consistent with crystallite structures containing up to four HgI/sub 2/ layers with dimensions in the layer plane ranging from 10 to 26 A. The lowest two energy peaks could not be accommodated by particles containing only a single layer of HgI/sub 2/. Published data on layered PbI/sub 2/ colloids are also believed to be incompatible with a single PbI/sub 2/ layer if more acceptable values of the effective masses for electrons and holes in PbI/sub 2/ are used in the analysis. Preliminary calculations indicate that the optical data are also consistent with a single particle size showing multiple transition between higher energy quantum levels of electrons and holes. The possible existence of magic number in HgI/sub 2/ colloids is inconclusive based on the optical data and electron microscopy.
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