Contamination layers formed on an aluminum foil by 2 MeV helium ion bombardment have been studied at various doses using backscattering technique. These layers occur on both surfaces of the aluminum foil, and are basically carbonaceous in nature with very low concentration of oxygen. The growth rate of carbon in the rear surface is almost double of that in the front surface. These layers have been observed by transmission electron microscope and an amorphous structure was revealed.
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