Answer:
Hydroxyls are the resulting molecules formed when UV-C radiation reacts with water molecules. This reaction will strip water molecules of one of their hydrogen atoms to create the hydroxide anion (OH-) and the free Hydrogen radical will also form hydrogen peroxide (H2O2) by combining with other hydrogen and oxygen atoms. Water molecules and the hydroxyl (OH-) apparently have a signature absorption of infrared energy at the 3.0 micrometer wavelength.