Trifluoroiodomethane (CF3I) has gained attention as a potential fire suppressant due to its low environmental impact. It is considered as an alternative to fire suppressants containing bromine or chlorine, which have been phased out due to their detrimental effects on the ozone layer under the Montreal Protocol, signed in 1987. CF3I exhibits a low ozone depletion potential and is therefore considered a promising candidate for new fire suppression systems. This study focuses on investigating the thermal dissociation rate constant of CF3I to CF3 + I. In order to measure the thermal dissociation rate, the time resolved concentration of I was measured using laser absorption and developing a robust method for predicting rate constants using laser absorption spectroscopy in a shock tube.