Accession Number:

ADA083551

Title:

Internal-Grating Electronographic Spectrographs for the Far Ultraviolet and X-Ray Wavelength Ranges,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1971-09-16

Pagination or Media Count:

18.0

Abstract:

Described are concave-grating spectrographs, of the normal-incidence and grazing-incidence types, using electronographic recording with a front-surface alkali-halide photocathode on the Rowland circle. The normal-incidence version uses magnetic focusing, with unity magnification, and is useful at wavelengths above 300-400 A. The grazing-incidence version is being developed in two types one uses magnetic focusing and near-unity magnification, and is intended for applications where high resolution is required but the available flux is relatively high the other uses electrostatic focusing and a large demagnification ratio and is intended for applications where resolution can be sacrificed to obtain higher sensitivity for weak sources such as celestial X-ray sources. The use of grazing incidence results in a higher quantum yield from the photocathode, as well as a higher reflectance from the grating, in the extreme ultraviolet and soft X-ray wavelength ranges. Author

Subject Categories:

  • Physical Chemistry
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE