Electron Diffraction by Hydrocarbons

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Abstract
Thin films of vaseline, paraffin, and tap grease were prepared (1) by evaporation from a heated filament on to a metal surface, (2) by allowing an ether solution to evaporate from a water or metal surface leaving the hydrocarbon film behind and (3) by smearing the greases on metal surfaces. When 25 to 50 kv electrons were reflected at grazing incidence from these films the diffraction patterns consisted of rows of spots similar to an x-ray single crystal rotation picture. The resolving power of all but the smeared films is much better than has been reported previously. Observed reflections are in good agreement with the structure of normal hydrocarbon crystals found by Müller. The patterns indicate that the films are largely, if not completely, crystalline, with the long axes of individual crystals perpendicular to the plane of the film.

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