This Reference Material can be used to qualify the wavelength calibration, in the ultraviolet and visible regions of the spectrum (290 nm - 870 nm) of spectrophotometers with spectral bandwidths of 5 nm or less.
Description and Discussion
Didymium (neodymium & praseodymium oxides) solvated in perchloric acid, permanently sealed by heat fusion into a 10 mm far UV quartz cuvette.
When prepared in perchloric acid, didymium gives a spectralscan containing a series of 14 characteristic and well-definedpeaks covering the wavelength range from 290 to 870 nm.
Approximate peak wavelength values (in nm) are:
298, 329, 354, 444, 469, 482, 512, 522, 575, 732, 740, 794, 799, 864
Note: The above values are for guidance only. Because the absorption bands are asymmetric, measured values will bespectral bandwidth dependent. The Calibration Certificate accompanying each Starna Samarium reference gives actual values measured at bandwidths of 0.10, 0.25, 0.50, 1.00, 1.50, 2.00, 3.00, 4.00 and 5.00 nm, and only these certified values should be used for instrument qualification. On request, Starna can provide certified values at other wavelengths and bandwidth values.
Didymium oxide liquid cell