Knowledge Bank

We have recorded high-resolution absorption spectra of ozone broadened by dry air, by $N2$ or by $O2$ using the McMath Fourier transform spectrometer at the National Solar Observatory on Kitt Peak. The spectra were recorded at room temperature, covering the region from approximately $2600cm-1$ to $3600cm-1$ at a resolution of $0.01cm-1$. Broadening gas pressures varied from approximately 100 to 400 Torr. From these spectra we have determined pressure broadening and line shift coefficients for over 200 lines in the $\nu 1+\nu 2+\nu 3$ and 3$v3$ bands. The halfwidth values obtained in these bands are similar to those obtained in the $\nu 1$ and $\nu 3$ bands, indicating that there is little vibrational dependence of the Lorentz broadening coefficient for ozone broadened by air, $N2$ or $O2$. However, the pressure line induced line shifts determined in the 3-$\mu$m bands are larger than those observed in the $4.8-\mu$m and $9-\mu$m $regions1-2$.