Abstract
Using CO 2 and N 2O lasers, we have measured and assigned nineteen ν 4 and nine ν 6 rotation-vibration resonances of the type Δ M = 0 and M = J. These transitions were combined with the zero-field pure rotational spectra in order to determine the two fundamental vibrational frequencies, the rotational constants of both excited states, the Coriolis coupling constant, and the dipole moments of each of the three states. The ground-state rotational constants and centrifugal distortion constants were taken from a microwave study and the centrifugal distortion constants of the excited states were assumed equal to those of the ground state. The following results were obtained (standard deviations in parentheses): ν 4 ν 6 ν 0 938.0345 (6) 989.2519 (18) (cm −1) A 139 579 (150) 143 323 (150) (MHz) B 31 873.6 (5) 32 379.5 (7) (MHz) C 26 242.9 (6) 25 994.4 (8) (MHz) ξ 64 (a) 136 178 (770) (MHz) μ 2.319 (10) 2.347 (4) (D) μ(ground state) 2.3464 (8) (D) The ν 0 and μ (ground-state) values agree with, but are more precise than other determinations, and the excited-state dipole moments are reported here for the first time. The values of some of the other parameters are consistent with those from a recent infrared spectrum.
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