Total photoabsorption cross-sections of trifluoromethyl sulfur pentafluoride, CF3SF5, were measured in the C, F and S K-shell regions by using a double ionization chamber and synchrotron radiation at the SPring-8 facility. The maximum cross sections were found to be 6.3, 5.0 and 1.1 Mb for the C, F and S K-edges, respectively. The spectral features in the F K-shell region were characterized by the photoabsorption spectra of CF4 and SF6 and those in the S K-shell region resemble the peaks of SF6. The observed peaks for CF3SF5 were tentatively assigned on the basis of a comparison with those for CF4 and SF6 measured simultaneously for references. (C) 2004 Elsevier B.V. All rights reserved.