Fourier transform infrared jet spectroscopy using a heated slit source

A supersonic slit-jet apparatus with a large heated slit nozzle apparatus used in combination with a high-resolution Fourier transform infrared spectrometer is described. The production of stable and reproducible expansions of samples, liquid under STP conditions, is demonstrated. The selective observation of vibrational hot bands is also achieved, with gas-phase species. The optimal available spectral resolution of the apparatus is illustrated.