Knowledge Bank

The pressure broadened widths of lines of carbon dioxide broadened by oxygen and dry air have been estimated by and analysis of the 9.4 and 10.4$\mu$m bands using methods described $previously1$. The data were obtained with a commercial Nicolet F.T.S. of resolution approximately $0.06cm-1$, a path length of 130 meters, and pressures of approximately one atmosphere. Spectra were obtained over a temperature range of about $60\circ C$, including room temperature. Preliminary estimates for $O2$ broadening are consistent with the few previous $results2,3$. In particular it has been found that the temperature dependence $(To/T)\gamma$ is more satisfactorily modeled with an exponent $\gamma$ of approximately. 75. $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$M. HOKE and J. Shaw, Applied Optics, 22, 328 (1983). $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$M. O Bulanin, V.P Bulychev, and E.B. Khodos, opt. Spectrosc., 48 (4), 403 (1980). $\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$R.L. Abrams, Applied physics Letters, 25, 609 (1974).