Rotational Analysis of the High-Resolution Infrared Spectra of the ν4 and ν5 Bands of Formyl Chloride

Abstract The high-resolution infrared spectra of the low-lying ν 4 and ν 5 fundamentals of the transient molecule formyl chloride, HCOCl, are reported. Both type A/B hybrid bands have been analyzed in detail, providing rotational assignments for the HCO 35 Cl and HCO 37 Cl isotopomers. The excited state rotational and centrifugal distortion constants have been determined by fitting assignments over a wide range of J and K a values. No perturbations were detected in either band.