HIGH-RESOLUTION IR SPECTROSCOPY OF JET-COOLED CF3CH2F

The mid-IR spectrum of HFC-134a, CF3CH2F, entrained in a supersonic jet expansion has been measured at high and low resolution and the rotational structure of the C-type bands v(14) (1204 cm(-1)) and v(15) (974 cm(-1)) has been analysed along with the hot band v(15) + v(18) <-- v(18). Rotational constants have been obtained and used to simulate the band structure, enabling the rotational temperature in the jet to be estimated at 65 K. In addition, low-resolution far-IR spectra of CF(3)GH(2)F in a room-temperature gas cell have been recorded and the vibrational fundamentals more completely assigned. These results are compared with previous experimental values and those predicted from molecular orbital calculations.