A precise study of the rotational spectrum of formaldehyde H212C16O,H213C16O,H212C18O,H213C18O |
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| Authors: | R Cornet G Winnewisser |
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| Institution: | 1. Max Planck Institut für Radioastronomie, Bonn, Germany;2. Physikalisch Chemisches Institut, Justus Liebig Universität, Giessen, Germany |
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| Abstract: | The rotational spectra of formaldehyde, H212C16O and its isotopic species H213C16O, H212C18O, and H213C18O 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 H212C16O and H213C16O a large number of ΔKa = ±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: | H212C16O | H213C16O | H212C18O | H213C18O | | 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) |
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