Knowledge Bank

We have recorded new high-resolution absorption spectra of ozone at room temperature using the Fourier transform spectrometer at the McMath-Pierce facility of the National Solar Observatory on Kitt Peak. The spectrometer was set up in double-pass $mode,1$ and appropriate filters were used to obtain coverage of the $800-1400cm-1$ region at $0.0027cm-1$ resolution. The ozone samples were contained in glass cells having crossed IR-transmitting and UV-transmitting paths approximately 10 cm in each direction. A 254 nm UV-absorption monitor of the same design as $Pickettetal.2$ was used to measure the ozone partial pressures, which ranged from approximately 0.4 to 1.7 Torr for the 20 spectra recorded. The best three of these spectra were chosen for analysis; for each of these spectra the ozone partial pressure, as measured by the UV monitor, varied by <0.5% during the 38-minute recording time. Using our multispectrum nonlinear least-squares $procedure,3$ we have fit these spectra simultaneously to determine intensities for a number of lines in the $990-1015cm-1$ region belonging to the P branch of the $\nu 3$ fundamental band. These initial results will be compared to previous measurements, and the problems and pitfalls of ozone intensity measurements will be discussed.