The 5VOH Overtone Transition of HDO

✍ Scribed by Elena Bertseva; Olga Naumenko; Alain Campargue

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 347 KB
• Volume: 203
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.2000.8167

✦ Synopsis

The absorption spectrum of HDO has been recorded by intracavity laser absorption spectroscopy in the 16 540 -17 055 cm Ϫ1 spectral region corresponding to the 5 3 band centered at 16 920 cm Ϫ1 . The (0 0 5) vibrational state is found to be mostly isolated from the nearby rovibrational states. The corresponding rovibrational transitions were analyzed and fitted in the frame of the effective rotational Hamiltonian model in Pade-Borel approximants form. The spectroscopic parameters retrieved from the fitting reproduce 100 of the 109 determined energy levels with the root-mean-square deviation of 0.0072 cm Ϫ1 , close to the experimental accuracy. From the integrated relative intensities of a-and b-type transitions, the angle between the transition moment and the OH bond is estimated to be 46.4°. This value is consistent with an increasing tilt of the transition dipole moment, away from the OH bond, when the OH stretching is excited. The evolution of the orientation of the transition dipole moment versus the vibrational excitation is then compared for the OH and OD overtone bands.