Knowledge Bank

The ever increasing need for improvements in the accuracy of remote sensing measurements of ozone in the Earth's atmosphere has motivated the effort we began several years ago to undertake a comprehensive program to improve the microwave and infrared spectroscopy of this molecule. High resolution (0.005 to $0.01cm-1$) laboratory spectra of natural, pure $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3$, and $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$-enriched samples recorded with the Fourier transform spectrometer at Kitt Peak have been analyzed to derive assignments, accurate positions, and accurate line intensities for all of the $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O3$ band systems between 3,3 and $14,3\mu m$ and the three fundamental bands of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O16O16O$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O18O18O$. Combining these results with the best experimental measurements in the microwave as well as powerful theoretical methods, it has been possible to generate a comprehensive compilation of improved line positions. intensities, and lower state energies for ozone bands occurring between 0 and $3400cm-1$. More than 160,000 vibration-rotation lines belonging to about 75 cold and hot bands have been calculated including the hot and cold pure rotation bands and the three fundamentals of $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O18O15O$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">16</mrow>}O16O18O$. Different examples showing comparisons of high resolution laboratory and atmospheric spectra with corresponding simulated spectra generated with the new line parameters will be presented. These comparisons illustrate the extensive improvements obtained with the new line parameters as well as the importance of the absorption by hot and the $\mathrm{<mrow\; data-mjx-texclass="ORD">18</mrow>}O$-monosubstituted isotopic bands