The infrared grating spectra of sgr;2for B10F3and B11F3have been reexamined from 650 to 750 K. Two samples of BF3, one composed of 93.4 percent B10F3and 6.6 percent of B11F3, and the other of the normal abundance ratio 20 percent B10F3and 80 percent B11F3were secured for the investigation. Complete resolution of the rotational fine structure of this parallelhyphen;type band was achieved. The following constants were obtained by means of the usual sort of rotational analysis: for B10F3, sgr;0= 718.23 K,B0= 0.35272K,B(v2= 1) = 0.35288K,DJ= 13.72times;10mdash;7K. For B11F3, sgr;0= 691.45 K and the rotational constants are the same for the two isotopic species.
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