A vacuum spectrometer capable of obtaining resolution approaching the maximum theoretical resolution of a 7-in. diffraction grating doubly passed has been constructed for use in the region of sensitivity of lead sulfide photo conductive cells. The design and construction of that instrument and its performance in the resolution of spectral details and the measurement of wavelengths are discussed.
D. H. RANK, G. D. SAKSENA, G. SKORINKO, D. P. EASTMAN, T. A. WIGGINS, and T. K. MCCUBBIN, JR., "Five-Meter Vacuum Spectrometer for the Near Infrared," J. Opt. Soc. Am. 49, 1217-1222 (1959)