HIGH-RESOLUTION INFRARED-SPECTRUM OF VINYL FLUORIDE AT 500 CM(-1)

The infrared spectrum of vinyl fluoride (CH2=CHF) has been investigate d in the region 390-590 cm(-1) at room temperature and at a resolution of 0.0016 cm(-1) using a Fourier transform spectrometer. The rovibrat ional analysis of the spectral features allowed us to assign about 11 000 lines (J less than or equal to 60) of the nu(9) ab-type band cente red at 483.0666 cm(-1) and more than 700 lines (J less than or equal t o 40) of the 2 nu(9) - nu(9) ab-type hot band, the bandcenter of which is located at 485.6687 cm(-1). The experimental data provided the rot ational and centrifugal distortion constants for the vibrational excit ed states nu(9) = 1 and 2 employing Watson's A-reduction Hamiltonian i n the I-r representation. Moreover, band origins, harmonic frequency, and anharmonicity factor have been obtained from the vibrational analy sis of the fundamental and the associated hot band. (C) 1997 Academic Press.