Experiments with Fluorescent X Rays in the 10- to 50-Å Wavelength Region

Abstract
Apparatus for the production, dispersion, and detection of soft fluorescent x‐rays (10 to 50 Å) is described. The apparatus includes a new type of gaseous discharge x‐ray tube capable of operating at 3000 v and 200 ma, a servo‐type vacuum controller for maintaining constant x‐ray tube current, and built‐up films of heavy‐metal soaps for use as analyzing crystals. Photographs are included of fluorescent spectral lines of carbon from graphite (Kα, λ=44.5 Å) and of copper (Lα, λ=13.3 Å) obtained, respectively, in 2 and in 4½ hr.
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