Spectroscopy of the ν5 band of CDF3 by heterodyne measurement of SMMW laser emission frequencies

Submillimeter wave laser action has been previously reported in deuterated fluoroform (CDF₃) which is optically pumped by a CO₂ laser. In this paper, accurate frequency measurements are reported for 23 laser emissions. Of these lines, 21 can be assigned to the ν₅ degenerate vibrational state. The data were fitted with a theoretical expression for the transitions containing terms up to sixth order in J and K and also containing all important doubling effects. The quality of the fit was very good, yielding accurate values for many of the molecular constants of the ν₅ state.