THE NU(2) AND NU(8)+NU(10) BANDS OF CF2=CH2

The high-resolution FTIR spectrum of CF2=CH2 was measured and analyzed in the Fermi interacting nu(2) and nu(8) + nu(10) bands around 1735 c m(-1). Both bands have strong infrared absorption with an A-type appea rance. Watson's A-reduced Hamiltonian in the Gamma representation was employed in the: computation of the energy levels, taking into account the Fermi resonance contribution. A total of 2119 nu(2) transitions a nd 2056 nu(8) + nu(10) transitions were eventually assigned with a rms deviation of 0.00075 cm(-1). In a nonlinear least-squares fit, accura te rovibrational constants of the upper states were determined with th e band origins nu(2) = 1728.49829 +/- 0.00005 cm(-1) and nu(8) + nu(10 ) = 1741.50207 +/- 0.00004 cm(-1). Finally, a set of equilibrium rotat ional constants of CF2=CH2 were derived. (C) 1997 Academic Press, Inc.