A novel procedure is described for the determination of concentrations of CF<sub>2</sub> and CF<sub>3</sub> radicals from the infrared spectrum using predicted values for the absolute integrated molar absorption coefficients. The predictions were made using an F-atom polar tensor transferred from CH<sub>3</sub>F according to procedures described earlier. These predicted intensities are used to calculate a simulated spectrum, adjusting the values assumed for the concentrations of CF<sub>4</sub>, CF<sub>3</sub>, and CF<sub>2</sub> until agreement is obtained with the experimental spectrum obtained by Milligan and Jacox from a sample of CF<sub>2</sub>N<sub>2</sub> photolyzed in an argon matrix in the presence of an added F-atom source. This procedure illustrates an analytical application of predicted infrared intensities that may also be important for other unstable species.

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