High resolution spectroscopy of the v3 band of DCOOD

The rotation-vibration spectrum of DCOOD has been recorded in the carbonyl stretch (nu(3)) region. Using a standard S-reduced Watson Hamiltonian in the I-T representation, 225 lines could be fitted to a vibrational-rotational band. A full set of molecular constants was obtained. The nu(3) band is found to be strongly perturbed in the K-a: 1 <-- 1 and K-a: 2 <-- 2 subband. The perturbation is attributed to a Fermi resonance with the 2nu(8) overtone band and Coriolis coupling to a combination band (nu(4) + nu(7)). The band center is determined to be 1725.1218(l) cut which is more than 10 cm shifted compared to previous studies. (C) 2002 Elsevier Science B.V. All rights reserved.