Infrared Spectrum of Pure Fluid Carbon Monoxide

Abstract

The infrared fundamental of pure CO is measured at supercritical temperatures between 298 K and 450 K up to a maximum pressure of 267 bar. The experimental IR bandshapes are adequately represented by summing up over the individual lines of the gaseous rotation-vibration spectrum assuming half-widths to be proportional to density. The molar integrated absorptivity is found to be independent of temperature and density which enables direct and precise measurements of CO concentrations in fluid phase equilibria and reactions.