A 6.65-m normal incidence vacuum spectrograph has been provided with a photoelectric scanner that is easily interchangeable with the original plate holder. The scanner consists essentially of a photoelectric detector and an exit slit that scans mechanically along the focal surface while the grating and entrance slit remain stationary. The design and construction of the 6.65-m scanning spectrometer, which operates in the 120-300-nm wavelength region, are discussed. The wavelength resolution of 0.001 nm obtained photoelectrically is better than that of any existing vacuum monochromator. The performance of the instrument is illustrated with vacuum ultraviolet scans of the (1, 5) band of fourth positive system of CO in emission, and the (14, 0) band of the Schumann-Runge system of O2 in absorption.

Yoshino, K.↗

NASA NTRS1980

Laboratory measurements of oscillator strengths of ultraviolet molecular lines of HCl and H2O and column densities of these molecules in the Zeta Ophiuchi cloud

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Smith, P. L.↗

NASA NTRS1980

High resolution vacuum ultraviolet absorption cross-sections of stratospheric molecules

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Parkinson, W. H.↗