One of the first problems in the installation of any new spectrophotometer is the verification of the wavelength calibration. There are several methods available for this procedure. For standardization each method employs some source of monochromatic light of a specific wavelength.
Proceedings of the Iowa Academy of Science
©1956 Iowa Academy of Science, Inc.
Melville, Robert S.
"The Use of the Didymium Filter for Wavelength Calibration in Spectrophotometry,"
Proceedings of the Iowa Academy of Science, 63(1), 419-422.
Available at: https://scholarworks.uni.edu/pias/vol63/iss1/40