A HIGH-RESOLUTION FOURIER-TRANSFORM INFRARED STUDY OF THE NU(3)-BAND, NU(4)-BAND, AND NU(5)-BAND OF DEUTERATED FORMYL CHLORIDE (DCOCL)

High-resolution infrared spectra of the low-lying nu(3), nu(4), and nu(5) fundamentals of the transient molecule DCOCl are reported. These type-A/B hybrid bands have been analyzed in detail, providing extensive rotational assignments for the (DCOCl)-Cl-35 and (DCOCl)-Cl-37 isotopomers. The ground state constants have been refined by a simultaneous fit of the available microwave data and FTIR combination differences from the three bands. The excited state constants have been determined by fitting assignments over a wide range of J and K-a values. A small perturbation was found at high K-a values in the nu(4) band and determined to be due to a Delta K-d = -2 interaction with the rotational levels of the 6(1) vibrational state. (C) 1995 Academic Press, Inc.