Abstract

To obtain true profiles of Fraunhofer lines, corrections for instrumental profile, ghosts, scattered light, etc., must be applied to the observations. A study of a 600 groove/mm Babcock grating in a high dispersion, vacuum spectrograph (8 mm/A, 5th order, λ 5461) is presented. Photographs of the hyperfine structure of the mercury line λ 5769 show a resolution of 630 000 in the 5th order. Photographs of Hg λ 2536 with a microwave-excited 198 lamp as a source exhibit a weakly self-reversed line. The measured separation of the components is 0.0021 A, corresponding to a resolving power of 1 200 000 in the 11th order. The instrumental profile, the intensities of satellite lines, and the ghost system have been determined by photoelectric scanning of the line λ 5461 of isotopic mercury. A determination of the vertical apparatus function shows that its half width is 15% wider than the theoretical value. The total intensity of the ghosts is 1.8% in the 5th order. A brief study of polarization effects and the nature of the blaze is presented. The general spectrographic scattered light was found to be 0.7%.

© 1957 Optical Society of America

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