High resolution synchrotron FTIR spectroscopy of the far infrared ν10 and ν11 bands of R152a (CH3CHF2)

High resolution (0.0019 cm−1) Fourier transform infrared spectra of R152a (CH3CHF2) at room temperature were measured using far infrared radiation from the IR beamline at the Australian Synchrotron. The a-type fundamentals ν10 = 569.12 cm−1 and ν11 = 468.34 cm−1 were assigned and analysed. Hot-band transitions centred at 471.18 cm−1 and 469.27 cm−1 were identified as 11 0 1 18 1 1 and 11 0 1 17 1 1 , respectively. Transitions were assigned with the aid of Loomis Wood plots, confirmed by combination differences and fitted with Pickett’s SPFIT/SPCAT to determine molecular constants.