Knowledge Bank

The absorption coefficients of $N2$-broadened $CO2$ lines were obtained from intensity measurements of the $\nu 1+4\nu 2+\nu 3$ and $2\nu 1+2\nu 2+\nu 3$ bands at 6228 and $6348cm-1$ respectively. A cooled absorption ceil with a base path of 0.75 m was used together with a Michelson interferometer. Theoretical resolution was $0.125cm-1$. Spectra were recorded at 193, 213, 233, and 293$\circ K$ with total pressures of 5 to 200 Torr. Broadening gas pressure varied between 5 and 100 Torr. A path length of 33 m was used in all cases. These determinations at low temperatures are of interest in the study of the Martian atmosphere.