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Absorption Spectrum of the OBr Radical


USING the flash photolysis technique of Norrish and Porter1,2 I have discovered a spectrum consisting of a series of roughly equidistant diffuse absorption bands which is attributed to the OBr radical. This spectrum was observed when mixtures of the vapours of bromo-substituted methanes and oxygen were irradiated by a flash discharge. Chloro-bromo-methane provided the most intense absorption bands, but they also appeared with the following compounds: CCl3Br, CCl2HBr, CBr2H2, CBr4; the strongest bands were also weakly visible in mixtures of oxygen and ethyl bromide.

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  1. 1

    Norrish and Porter, Nature, 164, 658 (1949).

  2. 2

    Porter, Proc. Roy. Soc., A, 200, 284 (1950).

  3. 3

    Coleman and Gaydon, Disc. Farad. Soc., 2, 166 (1947).

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