A series of new high ruling density (4800-groove/mm) concave gratings for 6.65-m spectrometers is being produced expressly for use in experiments using synchrotron radiation in combination with high-resolution spectroscopy. We report here the results obtained from extensive testing of a gold coated replica (125- × 110-mm ruled area) of the first grating in this series. This grating is blazed near 900 Å in first order, and the quality of the ruling is excellent. Comparisons with results obtained from other high-quality 6.65-m gratings of lower ruling densities are presented.
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Orth et al. (1986) studied this question.
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