Abstract

Photometric recordings of interferograms at λ 1850 Hg I, λ 1820 S I and λ 1807 S I show the feasibility of multiple beam interferometry down 1800 Å with double layer coatings of aluminum and magnesium flouride. The Fabry-Pérot spectrometer is constituted with a silica etalon and a vacuum monochromator. The method of pressure scanning is used with argon.

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