Trifluoromethane, CF3H, also known as fluoroform, is a member of the class of volatile organic compounds known as hydrofluorocarbons or HFC's. Fluoroform is a possible replacement refrigerant for chlorofluorocarbons or CFC's. This is because fluoroform is not photochemically active in the gas phase in the near ultraviolet (UV) or visible portion of the spectrum. Photochemistry may be induced on alkali halide surfaces because there are excitons in the halides that may transfer energy to molecules adsorbed on their surfaces. A series of experiments was performed with trifluoromethane adsorbed on different alkali halide surfaces such as KCl, NaCl, and NaBr. In three other separate experiments, trifluoromethane was adsorbed on two different alkali halides and irradiated in the presence of nitrous oxide and oxygen. A mercury vapor lamp was used as the light source. Previous experiments dealing with fluoroform have shown that there is no discernible photochemical activity present from 200 - 400 nm. The goals of this project were to determine if the exciton energy is transferred to the molecules through the use if the mercury vapor lamp, or if a photoreaction of excited N2O or O2 with the adsorbed CF3H occurs.