Didymium liquid filter (329 - 864 nm)

for checking the wavelength accuracy

The didymium liquid filter consists of praseodymium and neodymium, dissolved in perchloric acid. This filter is ideally suited for checking the wavelength accuracy of spectrophotometers in the UV and visible range. It has a spectrum with a variety of characteristic, very well-defined peaks in the range between 320 nm and 870 nm.

In USP<857>, this filter is recommended for checking the wavelength accuracy above 640 nm

USP <857> = United States Pharmacopeia, Chapter <857>

 

Typical spectrum of Didymium (praseodymium and neodymium) dissolved in perchlroic acid measured at a slit width of 1 nm.

 

ARTICLE-NO. 667025    Request this article
APPLICATION Checking the wavelength accuracy in the UV and Vis range
CONTENT Didymium in perchloric acid
STANDARD CERTIFICATION Wavelengths: 329, 469, 575, 740, 864 nm
Slit width: 1 nm; with DAkkS calibration certificate
POSSIBLE CERTIFICATION Wavelengths: 329, 354, 444, 469, 482, 512, 522, 575, 732, 740, 794, 801, 864 nm
Slit width: all up to 2 nm

 


ARTICLE-NO. 667025USP    Request this article
APPLICATION Checking the wavelength accuracy according to USP <857>
in the Vis range over 640 nm
CONTENT Didymium in perchloric acid
STANDARD CERTIFICATION Wavelengths: 732, 740, 794, 801, 864 nm
Slit width: 1 nm; with DAkkS calibration certificate
POSSIBLE CERTIFICATION Slit width: all up to 2 nm

 

Reference Materials (Brochure)

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