Abstract

The construction of a reliable photoelectron counter with a nickel cathode and a quartz envelope is described and an account is given of comparative tests on the measurement of the relative intensities of spectral lines with the counter and by means of photographic spectrophotometry. The counter has a linear response to variations of intensity of light over a wide range. For measuring the relative intensities of spectral lines the counter tube is mounted on a spectrograph behind a slit which moves on the focal plane of the instrument so that spectral lines are measured singly. The application of the counter in spectrochemical analysis is demonstrated and comparative analyses of the same materials by use of the counter and by the method of spectrochemical analysis are given. Studies on the constancy of several spectroscopic sources are described.

© 1942 Optical Society of America

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