ANALYSIS OF THE HIGH-RESOLUTION SPECTRA OF THE NU(5) AND NU(6) BANDS OF KETENE

The high resolution Fourier transform infrared spectrum of the ketene molecule has been analysed between 330 and 650 cm(-1). The upsilon(5) and upsilon(6) fundamental bands appear in this region, centered at 58 7 and 526 cm(-1), respectively. More than 1500 individual vib-rotation al transitions have been assigned. The observed wavenumbers are used a s data for a least squares refinement of the vibrational band origins and rotational parameters of the upsilon(5) = 1 and upsilon(6)= 1 stat es. Although a strong Coriolis perturbation is detected with the nearb y upsilon(9)= I state, the effective parameters refined in this work a re evaluated with good accuracy and lack of strong correlations. An es timate of the dipole moment ratio for the two vibrations agrees well w ith a more precise previous determination.