This reference material, known as HNL, is formulated for wavelength scale qualification of UV-visible spectrophotometers operating within the 240 to 795 nm spectral range. It is suitable for instruments with a spectral bandwidth of 5 nm or less.
The solution consists of Holmium oxide and Neodymium oxide dissolved in 10% v/v perchloric acid, permanently sealed by heat fusion inside a 10 mm far UV quartz cuvette. This composition provides stable and interference-free absorption peaks across a broad wavelength span, improving over previous references by extending the valid certified peak range from 219 nm to 864 nm.

This reference material, known as HNL, is formulated for wavelength scale qualification of UV-visible spectrophotometers operating within the 240 to 795 nm spectral range. It is suitable for instruments with a spectral bandwidth of 5 nm or less.
The solution consists of Holmium oxide and Neodymium oxide dissolved in 10% v/v perchloric acid, permanently sealed by heat fusion inside a 10 mm far UV quartz cuvette. This composition provides stable and interference-free absorption peaks across a broad wavelength span, improving over previous references by extending the valid certified peak range from 219 nm to 864 nm.