Laser Stark spectroscopy of FORMALDEHYDE-D2 (cas 1664-98-8): The Coriolis coupled ν4 and ν6 fundamentals

Add time:09/24/2019    Source:sciencedirect.com

Using CO2 and N2O lasers, we have measured and assigned nineteen ν4 and nine ν6 rotation-vibration resonances of the type ΔM = 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): ν4ν6ν0938.0345 (6)989.2519 (18)(cm−1)A139 579 (150)143 323 (150)(MHz)B31 873.6 (5)32 379.5 (7)(MHz)C26 242.9 (6)25 994.4 (8)(MHz)ξ64(a)136 178 (770)(MHz)μ2.319 (10)2.347 (4)(D)μ(ground state)2.3464 (8)(D)

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