[en] The chlorine hexafluoride radical was generated by γ radiolysis of SF₆ containing 5 mol percent of ClF₅ at -196⁰. The first-derivative ESR spectrum of solid irradiated SF₆ at -165 is shown. Septet substructures were attributed to hyperfine interactions. ESR parameter calculations indicate that the unpaired electron occupies the a*/sub lg/ orbital in O/sub h/ symmetry. As an alternative to O/sub h/ symmetry, the possibility that ClF₆ undergoes deformations similar to those deduced for XeF₆ is discussed. Reasons for the broadening of the ClF₆ spectral lines are considered. (U.S.)

[en] The BrF₆ radical has been obtained by γ irradiation of a mixture of BrF₅ in SF₆. The ESR spectrum was obtained and used to confirm the identity of the radical and to obtain hyperfine coupling constants. (AIP)