Determination of the spectroscopic constants of a dark vibrational state: Fermi and Coriolis perturbations in the [nu][sub 2] band of formyl chloride

The [nu][sub 2] infrared fundamental of the transient molecule formyl chloride, HCOCl, has been recorded at high resolution. Detailed assignments of the rotational structure have been made for both HCO [sup 35]Cl and HCO [sup 37]Cl. The [nu][sub 2] band, whose origin is at 1784.1377 cm[sup [minus]1]...

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