Rovibrational analysis of an intermolecular hydrogen-bonded vibration: The ν16 band of HCN---HF

The infrared spectrum of the intermolecular bending vibration, the ν16 band, of the heterodimer HCN---HF has been obtained with 0.010 cm−1 resolution, and the rotational structure of this band has been assigned. The spectroscopic constants of the ν16 state in cm−1 are: ν0=550.0285(2); B6=0.117 652 9(10); D6J =0.2791(5)×10−6; q6=0.579(8)×10−4; α6=−0.002 137(1), where the uncertainties cited are one standard deviation.