Preparation of self-supporting carbon foils of uniform thickness below 2 μg/cm2 density

Abstract
Self‐supporting thin carbon foils (areal density, 5 μg/cm2) produced by vacuum evaporation are thinned to less than 1 μg/cm2. The thinning is achieved by the bombardement of atomic hydrogen produced from the dissociation of H2 at the surface of a hot tungsten filament (temperature, 2450 K). The areal density of the foils is measured by means of uv light transmission. The thinned foils are mechanically stable and uniform in thickness.