Abstract
The ν2 (F–O stretching) band of the FO2 radical was observed in the gas phase at Doppler-limited resolution by an infrared diode laser spectrometer. The FO2 radical was generated in a flow cell by the reaction of O2 with microwave discharge products of a F2 and He mixture. The observed spectrum was analyzed to obtain the rotational, centrifugal distortion, and spin-rotation interaction constants for the first time. The band origin was determined to be 579.318 39(35) cm−1, which was found to be lower than the values in matrices previously reported by 5 to 7 cm−1. Intensity alternation was observed in neither Ka nor N, and the possibility that the molecule takes a symmetrical OFO structure was eliminated. A preliminary analysis of the observed data indicates that the F–O and O–O bonds are close to 1.65 and 1.20 Å, respectively.
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