The infrared spectrum of CF2CH2 has been investigated in the CH2 symmetric stretching region near 3060 cm-1 at a resolution of about 0.004 cm-1 using a Fourier transform infrared spectrometer. The analyzed ν1 fundamental of symmetry species A1 gives rise to an a-type band reflecting characteristics typical of molecules approaching to the oblate symmetric top limit. The band was found to be affected by different Coriolis-type resonances, and several states such as ν2 + ν8, 2ν8 + ν10, ν8 + ν9 + ν11, and ν2 + ν5 + ν11 seem to be involved in the interactions. The rovibrational analysis led to the identification of about 1700 lines in the P, Q, and R branches with J, Ka, and Kc values up to 59, 20, and 59, respectively. Transitions free of major resonance contributions were fitted using the Watson′s A-reduction Hamiltonian in the Ir representation; a least-squares fit of about 1000 lines yielded a set of effective constants for the v1 = 1 state of CF2CH2. © 1993 Academic Press, Inc.
High-Resolution FTIR Spectrum of CF2=CH2 near 3060 cm-1: Rovibrational Analysis of the Methylene Symmetrical Stretching
DE LORENZI, Alessandra;S. GIORGIANNI;
1993-01-01
Abstract
The infrared spectrum of CF2CH2 has been investigated in the CH2 symmetric stretching region near 3060 cm-1 at a resolution of about 0.004 cm-1 using a Fourier transform infrared spectrometer. The analyzed ν1 fundamental of symmetry species A1 gives rise to an a-type band reflecting characteristics typical of molecules approaching to the oblate symmetric top limit. The band was found to be affected by different Coriolis-type resonances, and several states such as ν2 + ν8, 2ν8 + ν10, ν8 + ν9 + ν11, and ν2 + ν5 + ν11 seem to be involved in the interactions. The rovibrational analysis led to the identification of about 1700 lines in the P, Q, and R branches with J, Ka, and Kc values up to 59, 20, and 59, respectively. Transitions free of major resonance contributions were fitted using the Watson′s A-reduction Hamiltonian in the Ir representation; a least-squares fit of about 1000 lines yielded a set of effective constants for the v1 = 1 state of CF2CH2. © 1993 Academic Press, Inc.
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