DOUBLE RESONANCE IDENTIFICATION OF ROTATIONAL TRANSITIONS AND CENTRIFUGAL DISTORTION ANALYSIS OF COF2

The millimetric wave spectrum of COF2 has been measured in the frequency range 100,000-200,000 Mc. Double resonance experiments were carried out in order to identify some previously measured low frequency lines and some of the high frequency transitions. The following values in Mc/s of the centrifugal distortion and rotational constants were obtained by centrifugal distortion analysis of all low and high frequency transitions. τaaaa = -0·0653935 ± 0·0000921 τbbbb = -0·0451722 ± 0·0000933 τaabb = 0·0246729 ± 0·0008584 τabab = -0·0351807 ± 0·0004393 A = 11813·550 B = 11753·049 C = 5880·896. The force constants corresponding to the B1 species 2 × 2 GF matrix were also obtained. Their values are: F44 = 4·95 ± 0·01 mdyn/Å F55 = 1·28 ± 0·02 mdynÅF45 = 0·48 ± 0·02 mdyn. © 1969.