Knowledge Bank

The H-F stretching bands of the HF van der Waals complexes with $CO2.OCS$, and NO have been recorded with an optothermal (bolometer-detected) molecular-beam color-center laser spectrometer. As with the $CO2$ complex observed $previously,1$ the OCS species has a low frequency mode associated with a large amplitude bending-rotation motion of a quasilinear molecule. The H-F stretching bands are red shifted from the isolated monomer by 52.10 and $57.48cm-1$ for $CO2$ and $OC32S$ respectively, while the low frequency mode ``hot'' bands are further red shifted by 2.69 and $2.46cm-1$ respectively. The spectrum of the NO complex is complicated by the presence of the unpaired electron in the ground state and has not yet been interpreted. Vibrational predissociation linewidths for the three species are in the range of 100-200 MHz (FWHM).