All gas compounds absorb UV light energy at specific wavelengths. UV DOAS analyzers detect gas compounds found present in a reflected UV light beam. For a gas compound to be detected by a UV DOAS analyzer, there must be enough UV energy present at the wavelength’s point of absorption.
Cerex offers two UV bulb types – Deuterium and Xenon. The primary reason to select one bulb type over the other is to have sufficient energy for analysis for your compounds of interest.