The structure of vapour-deposited films of molecular arsenic (As4)

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Abstract
Amorphous films of ‘yellow arsenic’ composed of As4 molecules have been prepared by deposition from the vapour onto a substrate at 30 K in an X-ray diffractometer. X-ray diffraction measurements have been made at 30 K and at higher temperatures, and radial distribution functions determined. The local structure may be successfully modelled by staggered face-to-face packing of As4 tetrahedra, but attempts to model the longer range packing of As4 tetrahedra using quasi-crystalline models have had only limited success. The molecular film readily polymerizes on heating, even for T < 80 K, and the final structure at ambient temperature closely resembles that of amorphous β-arsenic.

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