Studies of low-frequency intermolecular hydrogen-bonded vibrations using a continuous supersonic slit jet mid-infrared quantum cascade laser spectrometer

► Low frequency bridged hydrogen-bonded intermolecular vibrations are characterized. ► The performance of a near infrared QCL spectrometer is reported by studying OC-HCl. ► Analysis of OC-HF shows applicability to vibrations 80 cm−1 above ground states. ► Characteristics of OC-HCN are compared with those in OC-HX (X = F, Cl, Br, I).