The UV absorption spectrum of C2F5I was studied in shock waves over the temperature range 580-1200 K and, together with room temperature data, was represented in extended Sulzer-Wieland form. As a case study, the work illustrates the properties of high-temperature UV absorption continua for use in kinetics experiments in shock waves. A comparison with experimental data for CF3I and their representation is made. Quantum-chemical model calculations of positions and oscillator strengths are tested and, besides CF3I and C2F5I, applied also to spectra of C2F4I, C2F4, CF2I, C2F2, C2F, CF2, CFI, CF, and IF. Likewise, modelling and experimental results for the high-temperature UV absorption spectra of CF3 and C2F5 radicals are considered. (C) 2020 Published by Elsevier Inc. on behalf of The Combustion Institute.