A Program Of Basic Research To Study X-ray Spectra In The Region 15-50 Å 

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Report Number: WADD TR 61-168
Author(s): Furnas, Thomas C., Jr., White, Eugene W.
Corporate Author(s): Picker X- Ray Corporation
Laboratory: Directorate of Materials and Processes
Date of Publication: 1961-05
Pages: 30
Contract: AF 33(616)-7177
DoD Project: 7364
DoD Task: 73640
Identifier: AD0276293

Abstract:
A vacuum spectrographic system has been designed and built for the study of x-ray spectra in the 15 to 50 Å region. This spectrograph is equally well suited for use throughout the ordinary x-ray region from 0.1 to 15 Å. Initial and principal experiments with the system will be with Bragg Law analyzers; however, the system is dimensionally compatible with the installation and use of grazing incidence gratings should it be desired to extend the experiments to include comparisons of performance. The present spectrometer drive is accurate to better than ±0.02° and reproducible to ±0.002°. A specimen can be excited either by direct electron bombardment or by high intensity x-rays. The versatile generator arrangement provides fully stabilized outputs of up to 30,000 volts full wave rectified or at constant potential and up to 100 ma. Analyzers built from monomolecular barium stearate films have yielded strong, sharp diffraction lines from as few as 140 layers. The 50.2 Å d spacing of these analyzers is ideal from the standpoint of any future use in double crystal spectrometer arrangements.

Provenance: IIT

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