5min:

M. A. H. SMITH, C. P. RINSLAND, Atmospheric Sciences Division, NASA Langley Research Center, Mail Stop 401A, Hampton, VA 23681-2199; V. MALATHY DEVI AND D. CHRIS BENNER, Department of Physics, The College of William and Mary, Box 8795, Williamsburg, VA 23187-8795.

We have completed our analysis of high-resolution (0.0027 cm^-1) absorption spectra of ozone to determine absolute intensities of 376 ¹⁶O₃ lines in the 9-11 µm region. The spectra were recorded at room temperature using the Fourier transform spectrometer at the McMath-Pierce facility of the National Solar Observatory at Kitt Peak. The ozone samples were contained in a glass cell having crossed IR-transmitting and UV-transmitting paths approximately 10 cm in each direction. The ozone partial pressures (0.3 to 0.5 Torr) in the cell were determined from measurements of the 254 nm UV-absorption, using the absorption cross-section of Mauersberger et al. as a reference standard. Only spectra for which the ozone partial pressure varied by < 1.0 % during the recording time were selected for analysis. A multispectrum nonlinear least-squares procedure was used to fit four spectra simultaneously to determine intensities for 366 lines in the P, Q, and R branches of the ₃ fundamental band and 10 lines in the R branch of the ₁ band. The absolute accuracy of these intensity values ranges from 2 % for the strongest, most well-determined lines to 4 or 5 % for the weakest lines measured. On average, our measured intensities are approximately 1 % larger than the values on the current HITRAN compilation.\footnoteL.~S.~Rothman et al. , JQSRT \underline\textbf48, 469-507 (1992); L.~S.~Rothman et al. , JQSRT , in press (1998). Our measurement set includes 44 ₃ lines in common with other recent experimental studies. Comparison of these various measurements shows excellent agreement for a few lines and adequate agreement (considering all possible sources of uncertainty and systematic errors) for the others.