Use of a 10 eV monochromatized krypton lamp for ultraviolet photoelectron spectrometry

A method for the monochromation of an ultraviolet lamp for photoelectron spectrometry using a temperature-controlled magnesium fluoride filter is presented. Typically, open optical path helium discharge lamps are used as the light source for this technique, requiring complex differential pumping systems. A simple alternative solution using a sealed krypton resonance lamp with an independently heated magnesium fluoride glass filter is described. By heating the this output filter to 170–180 °C, its short wavelength transmittance limit is shifted, selectively blocking the 116.5 nm low intensity resonance line while maintaining transparency to the main line of 123.6 nm (10.03 eV). Validation of the method through work function measurements on polycrystalline copper samples yielded values of 4.6 ± 0.1 eV, consistent with data reported in the literature. This technique offers a more accessible and less complex solution for spectrometry laboratories without compromising measurement accuracy.