Knowledge Bank

We have recorded high-resolution absorption spectra of ozone broadened by dry air at a number of temperatures from $-63\circ C$ to $23\circ C$ using the Fourier transform spectrometer at the McMath-Pierce facility of the National Solar Observatory on Kitt Peak. The spectra cover the $600-2700cm-1$ region at $0.005cm-1$ resolution. Broadening gas pressures varied from approximately 100 to 250 Torr. Using a multispectrum nonlinear least-squares $procedure1-2$, we fit 29 of these spectra simultaneously to determine the air-broadening and shift coefficients and their temperature dependences for nearly 550 lines in the $\nu 1$, band. Self-broadening coefficients were also determined. These results cover a wide range of rotational quantum numbers, particularly in the {R} branch, with $J\prime \prime \le 55$ and . The variation of the retrieved broadening and shift parameters with the rotational quantum numbers has been examined; particularly interesting behavior is noted as the value of $Ka\prime \prime$ approaches that of $J\prime$. The broadening and Shift results compare well with previous room-temperature measurements in the $\nu 1$, band, and they are also consistent (within the stared uncertainties) with the few previous measurements of the temperature dependence of air-, $N2$-and $O2$-broadening coefficients in other $O3$ bands. Results in the $\nu 2$ band have recently been obtained (see the following paper), and analysis of lines in the $\nu 1+\nu 3$ band is progress.