Abstract

Careful measurements of pressure broadening in CO₂ have been made in the v₃ band of CO₂. The sample was contained in a 2m long multiple traversal cell set for four transits. The long pathlength allowed very low partial pressures of CO₂ to be used. The temperature could be set anywhere between room temperature and 200 K and several recordings were made in this range. Nitrogen, oxygen and air (actually mixtures of pure nitrogen and oxygen since laboratory air contained far too much CO₂) were used as collision partners at pressures up to 200 Torr. The spectrometer was a modified (1) Bomem DA8 instrument. With an InSb detector and a CaF₂ beam splitter we were able to attain signal to noise ratios between 1000:1 and 2000:1.

© 1995 Optical Society of America