The Fourier transform infrared spectrum of CF2CH2 has been investigated in the ν8 band region around 1301 cm-1 with a resolution near the Doppler limit. This fundamental of symmetry species B1, mainly involving the CF2 asymmetric stretching motion, gives rise to a strong b-type band. The rovibrational analysis in the P, Q, and R branches led to the identification of more than 2800 lines with J, Ka, and Kc values up to 71, 53, and 70, respectively, which were fitted using the Watson′s A-reduction Hamiltonian in the Ir representation. A least-squares fit of the assigned transitions provided a set of accurate rotational and quartic centrifugal distortion constants for the first excited vibrational state of the ν8 band. A weaker b-type absorption at 1320 cm-1, mostly dispersed under the very strong fundamental, has also been analyzed and the band has been attributed to the 3ν10 overtone. From about 570 assigned transitions with J, Ka, and Kc up to 55, 17, and 55, for the most part belonging to the R branch, a set of molecular constants was determined for the v10 = 3 state of CF2CH2. © 1993 Academic Press, Inc.
High-Resolution Fourier Transform Infrared Spectrum of CF2CH2 in the ν8 Region near 1300 cm-1
S. GIORGIANNI;DE LORENZI, Alessandra;
1993-01-01
Abstract
The Fourier transform infrared spectrum of CF2CH2 has been investigated in the ν8 band region around 1301 cm-1 with a resolution near the Doppler limit. This fundamental of symmetry species B1, mainly involving the CF2 asymmetric stretching motion, gives rise to a strong b-type band. The rovibrational analysis in the P, Q, and R branches led to the identification of more than 2800 lines with J, Ka, and Kc values up to 71, 53, and 70, respectively, which were fitted using the Watson′s A-reduction Hamiltonian in the Ir representation. A least-squares fit of the assigned transitions provided a set of accurate rotational and quartic centrifugal distortion constants for the first excited vibrational state of the ν8 band. A weaker b-type absorption at 1320 cm-1, mostly dispersed under the very strong fundamental, has also been analyzed and the band has been attributed to the 3ν10 overtone. From about 570 assigned transitions with J, Ka, and Kc up to 55, 17, and 55, for the most part belonging to the R branch, a set of molecular constants was determined for the v10 = 3 state of CF2CH2. © 1993 Academic Press, Inc.
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