Knowledge Bank

Self-broadened halfwidths at room temperature have been determined for 355 spectral lines of five different vibration-rotation bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3$ in the 4.8-17 $\mu m$ region $(v2,v1,v2+v3,v1+v3,$ and $2v3)1$. These results were obtained from absorption spectra recorded at $0.005cm-1$ resolution using the McMath Fourier transform spectrometer at the National Solar Observatory on Kitt Peak. The halfwidth values were obtained through a nonlinear last-squares spectral fitting procedure. The resulting self-broadening coefficients lie within the range of 0.08 to $0.12cm-1atm-1$ and are in good agreement with most of the previous measurements. No significant differences were observed between halfwidths of lines with the same J"" and $Ka$"" quantum numbers from band to band or from branch to branch within a band. The present study covers a sufficiently wide range of rotational quantum numbers (J"" up to 48, $Ka$"" up to 13) to permit a detailed examination of the variation of the ozone self-broadening coefficient with these quantum numbers.