Abstract
A fast atom bombardment (FAB) source has been used to produce thin carbon films using butane (calor gas) and butane-argon mixtures. The films were produced on CR39 polycarbonate, glass, aluminium foil and single-crystal sodium chloride substrates. The films were studied by X-ray photoelectron spectroscopy, Auger electron spectroscopy, transmission electron microscopy and transmission electron diffraction. The carbon films were largely amorphous with small crystallites scattered across the film surface. The majority of these crystallites have been identified as either the alphacarbine or the Ries crater forms of carbon. Some of the crystallites were found to decompose in the electron beam during transmission electron microscope studies. It is suggested that hydrogen, argon, or a hydrocarbon gas is trapped between the layers during the growth of these hexagonal layer structured forms of carbon. Prolonged electron irradiation is likely to lead to the evolution of this intercalated material. Auger spectra are presented that suggest that argon ion bombardment also produces evolution of intercalated material and hence significantly modifies the surface of the films.
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