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Wavelength
For the measurement of this fundamental parameter, Starna® offers you the choice of either sealed cell, or filter materials. Please note that your selection process should not only include the wavelength(s) required, but also the spectral bandwidth (SBW) of your spectrophotometer. Use of the reference materials outside the SBW range detailed is not excluded, but at higher spectral bandwidths some of the certified peaks may not be resolved from the overall background spectrum.
Holmium Oxide - UV and Visible Wavelength
Description:
Holmium oxide (4% m/v) in 10% v/v perchloric acid.
Primary Usage: Assessment of wavelength scale accuracy in both UV and visible regions.
Useable range: 240 nm to 650 nm, instruments with spectral bandwidth of less than 3 nm.
Physical Configuration: Far UV quartz cells that have been permanently heat sealed.
Holmium Oxide - UV and Visible Wavelength
The use of holmium oxide solvated in perchloric acid is an established and well recognised method for the validation of the wavelength scale of a spectrophotometer in the UV and visible regions. When prepared in perchloric acid, holmium oxide gives a spectral scan containing a series of characteristic peaks. However, these values are dependent and will vary with the spectral bandwidth of the measuring instrument (NIST Special Publication 260
-120)     (see MSDS)
RM-HL:

Consists of one sealed cell, with certified peak at spectral bandwidth values of 0.10 nm, 0.25 nm, 0.50 nm, 1.00 nm, 1.50 nm, 2.00 nm and 3.00 nm.
   Typical values obtained:
SBW nm nm nm nm nm nm nm nm nm nm nm nm nm nm
0.10 640.54 536.47 485.26 467.88 452.13 416.16 385.55 361.43 345.60 333.52 287.10 278.29 249.85 241.07
0.25 640.52 536.52 485.29 467.84 452.12 416.16 385.48 361.42 345.46 333.56 287.12 278.26 249.88 241.09
0.50 640.52 536.55 485.31 467.90 451.99 416.19 385.61 361.39 345.54 333.61 287.19 278.29 249.94 241.6
1.00 640.65 536.85 485.37 467.93 451.38 416.58 385.90 361.18 345.56 333.64 287.66 278.28 250.14 241.33
1.50 640.58 536.66 485.31 467.88 451.37 416.40 385.78 361.41 345.53 333.58 287.39 278.27 250.00 241.30
2.00 640.85 537.01 485.29 468.00 451.42 416.73 385.90 361.13 345.66 333.62 287.78 278.25 250.25 241.34
3.00 641.29 537.50 485.28 468.14 451.45 417.04 386.17 361.11 345.67 333.74 287.91 278.30 250.38 241.34
Holmium Oxide cell All Starna holmium oxide cells are prepared in accordance with "Holmium Oxide Solution Wavelength Standard From 240 to 640 nm – SRM 2034” (NIST Special Publication 260-54). After filling under controlled conditions, the cells are then permanently sealed by heat fusion and the values certified by the procedure described below.
Calibration procedure:
Traceability:
• Primary instrumental wavelength calibration is established using the emission lines
Holmium liquid graph
  • Additional traceability links to NIST primary materials are established using SRM 2034 holmium oxide (4% m/v) in perchloric acid (10% v/v).

•Use: All appropriate fundamental parameters and procedures relating to measurement, handling and storage are fully documented on the certificate supplied with each Certified Reference Material.

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