| Abstract: | The Fourier transform infrared spectrum of the υ 3 and υ 9 bands of methylene fluoride-d 2 (CD2F2) has been recorded with an unapodized resolution of 0.0024cm-1 in the frequency range 970-1080cm-1. These two bands with band centres approximately 26 cm-1 apart were mutually coupled by Coriolis interactions. By fitting a total of 1639 infrared transitions of both υ 3 and υ 9 with a standard deviation of 0.00084cm-1 S/S using a Watson's A-reduced Hamiltonian in the I r representation with the inclusion of a first order c-type Coriolis resonance term, two sets of rovibrational constants for υ 3 = 1 and υ 9 = 1 states were derived. The υ 3 band is B-type while the υ9 band is A-type with band centres at 1030.1573 ± 0.0003 and 1003.7435 ± 0.0001cm-1, respectively. |
