Abstract
Abstract From the observation of double resonance effects on the microwave spectrum two coincidences between 9.4 μm CO 2 laser lines and infrared transitions of the ν 6 → (ν 6 + ν 1 ) band of CF 3 79 Br have been determined: R (30) laser line coincident with q R 2 (7), F = 17/2→17/2 transition, R (28) laser line coincident with all four Δ F = 0 hyperfine components of the q Q 8 (13) transition. In both cases other infrared transitions lay within the tuning range of the laser. The frequencies of these two laser lines allowed calculations of the band center frequency ν 0 = 1083.530 ± 0.001cm −1 and α A = 11.93 ± 0.3MHz, for the ν 6 → (ν 6 + ν 1 ) band.α B constants were determined for the vibrational states v 6 , ( v 6 + v 1 ), v 1 , and v 3 .
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