Abstract
The rotational spectra of formaldehyde, H 2 12C 16O and its isotopic species H 2 13C 16O, H 2 12C 18O, and H 2 13C 18O have been investigated in the ground vibrational state in the frequency region between 8 and 460 GHz. For most cases in which measurements of the a-type R- and Q-branch transitions already existed the accuracy of the line position has been improved to about 10 kHz. For H 2 12C 16O and H 2 13C 16O a large number of Δ K a = ±2 transitions were measured with similar accuracy. These new data when combined with all other available data and appropriate weightings lead to a set of ground state parameters which for the first time are compatible with infrared and ultraviolet data. The rotational constants (and 3σ standard deviations) obtained using Watson's A-reduced Hamiltonian are: H 2 12C 16O H 2 13C 16O H 2 12C 18O H 2 13C 18O A/MHz 281 970.572 (24) 281 993.258(135) 281 961.94 (39) 281 985.00 (93) B/MHz 38 836.0456(13) 37 811.0887(25) 36 904.1693(66) 35 859.256(10) C/MHz 34 002.2034(12) 33 213.9790(25) 32 511.5311(63) 31 697.868(10) This paper reports the first observations of the H 2 13C 18O rotational spectrum.
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