Nearhyphen;ultraviolet photolysis of matrix (N2or Ar)hyphen;isolated chlorine trifluoride (ClF3) or mixtures of chlorine monofluoride (ClF) and fluorine at 16deg;K results in the production of a new infrared absorption at sim;thinsp;575 cmminus;1. This band is assigned to the asymmetric stretching vibration of the chlorine difluoride (ClF2) free radical on the basis of the chemistry of the system, temperature dependence of the band intensity, and results of isotopic labeling. Much weaker bands, assigned to the symmetric stretching vibration and to the bending motion, are observed at 536 and 242 cmminus;1, respectively. The apex angle and force constants are calculated from the data.
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