TEMPERATURE DEPENDENCE OF AIR-BROADENING AND SHIFT COEFFICIENTS OF O-3 LINES IN THE NU(1) BAND

摘要

High-resolution Fourier transform absorption spectra of ozone broadened by dry air have been recorded at a number of temperatures from -63 degrees C to 29 degrees C. Using a multispectrum nonlinear least-squares procedure, we fit 29 of these spectra simultaneously to determine the air-broadening and shift coefficients and their temperature dependences for 450 lines in the 9-mu m region; most of these belong to the nu(1) band. Partial air-broadening results were obtained for 104 additional lines, and room-temperature self-broadening coefficients were also determined for most of the 554 lines measured. These results cover a wide range of rotational quantum numbers, particularly in the R branch, with J '' less than or equal to 55 and K-a '' less than or equal to 12. The variation of the retrieved broadening and shift parameters with the rotational quantum numbers has been examined; particularly interesting behavior of the broadening coefficients is noted as the value of K-a '' approaches that of J ''. The broadening and shift coefficients compare well with previous room-temperature measurements in the nu(1) and other bands. The temperature-dependence results are also consistent (within the stated uncertainties) with the few previous measurements of the temperature dependence of air- and N-2-broadening coefficients in other O-3 bands, but disagree with the mean value given in the HITRAN compilation. (C) 1997 Academic Press. [References: 37]