Abstract

This paper reports another phase of the program being followed by the Inspection Division of Socony-Vacuum Laboratories, Technical Service Department, which is designed to reduce the size of samples and to improve the efficiency of spectroscopic analyses. Two wave-length ranges are recorded from a single exposure by the use of an auxiliary mirror system in a Littrow-type prism spectrograph.

Radiation incident on the upper half of the prism-lens aperture receives the dispersion and collimation to produce the normal ultraviolet spectrum on the photographic plate. A system of two mirrors, interposed before the lower half-aperture, provides an additional angular deviation and increase in path length to produce a visible spectrum adjacent to the ultraviolet spectrum.

The instrument described was designed for use with a Bausch and Lomb large Littrow spectrograph. Its purpose is to record, in one exposure, a spectral range sufficient for the detection and semiquantitative estimation of all the elements, except boron, which can be excited in an arc. Through the use of the auxiliary unit, the range 2530 to 3500A and any 4000 angstroms between 3540 and 10,000A are covered in one exposure, including, for example, the four phosphorus lines and the potassium lines at 7665 and 7699A.

The elimination of an extra exposure results in substantial reductions in analytical time and in the required size of samples, thereby achieving very desirable economies in the costs of spectroscopic analyses.

© 1950 Optical Society of America

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