5314027760

POSTER SESSION. H13

INTENSITIES, WIDTHS AND SHIFTS OF 0₂ AT 0.762 /im

L. R. BROWN. Jet Propulsion Laboratory, Califomia Institute of Technology, Pasadena, CA, 91109; C. PLYMATE, NOAO / National Solar Observatory, Tucson, AZ 85726.

SAGĘ III, an EOS remote sensing experiinent scheduled to orbit the Earth, will utilize the prominent features of the oxygen A-band to monitor atmospheric pressure and temperaturę. To validate the 0₂ linc parameters, the intensities, pressure-broadened linę widths and pressure-induced frequency shifts of the strongest transitions between 13040 and 13165 cm”¹ were measured using the McMath Fourier transform spectrometer located at Kitt Peak National Observatory / National Solar Observatory in Arizona. Absorption spectra at 0.02 cm"¹ resolution were taken with gas sainples of pure oxygen and oxygen / nitrogen mixtures at room and cold temperatures (down to 200 K) in order that the temperaturę dependences of the self- and nitrogen-broadened widths could be determined. Four spectra of water were also obtained with the FTS in the same configuration in order to check the performance of the spectrometer. This was achieved by remeasuring intensities of seven H₂0 transitions near 0.72 /im. The new measurcments were found to agree with prior H₂0 results ° to within 1.5% while the measured 0₂ intensities matched calculated values with an rms of 1%. Finally, for wavenumber calibration. a broad band spectrum was recorded between 4000 and 14000 cm”¹ using InSb and Silicon diodę detectors simultaneously; with this, the lino positions of the A-band of oxygen were refereneed to CO standards ^{1 2 3} in the 2-0 and 3-0 bands (at 2.35 and 1.57 /im respectively). Comparisons of the present results to the 1996 HITRAN values and to other published measurcments for this band will be shown. ^c

1

“ sec K. Singh and J. J. 0’Brien. J. Mol. Spectrosc. vl67. 99-108 (1994) and the references

2

therein.

3

C. R. Pollock, F. R. Petersen, D. A. Jennings, J. S. Wells and A. G. Maki, J. Mol. Spectrosc. v30, 37-44 (1983) and N. Picque and G. Guelachvili. J. Mol. Spectrosc. vl85, 244-248 (1997).

^c Part of this research reported in this paper was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Acronautics and Space Administration.