High-Temperature Ultrahigh-Resolution Absorption Cross Sections of O2 in the 83.4, 91.6, and 108.5 nm Regions

Details High-Temperature Ultrahigh-Resolution Absorption Cross Sections of O2 in the 83.4, 91.6, and 108.5 nm Regions High-Temperature Ultrahigh-Resolution Absorption Cross Sections of O2 in the 83.4, 91.6, and 108.5 nm Regions

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52a13w&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA52A-13

Physics

0310 Airglow And Aurora, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 2407 Auroral Ionosphere (2704), 2459 Planetary Ionospheres (5435, 5729, 6026, 6027, 6028), 2704 Auroral Phenomena (2407)

Scientific paper

This is a progress report regarding the high-temperature ultrahigh-resolution photoabsorption cross section measurements of N2 and O2 in the extreme ultraviolet (EUV) region, and their atmospheric modeling implications. The NII 108.5 nm, NII 91.7 nm, and the OII 83.4 nm are the prominent emission in the EUV airglow [1-5]. The atmospheric extinction due to absorption by molecular N2 and O2 strongly affects the observed airglow emission fluxes. Since the temperature of the upper atmosphere of the Earth is typically in the 300 to 900 K range it is important to know all relevant molecular cross sections at such temperatures. A temperature change on a gaseous sample clearly will affect the Doppler broadened linewidth and the rotational and vibrational population distributions of the ground electronic state from which absorption takes places. The consequences of such a change are the enhancement or elimination of hot bands, the broadening or sharpening of vibronic line shapes, the decreasing or increasing in cross section values at the peak or valley of an absorption feature [6-7]. In our most recent work we have carried out ultrahigh resolution absorption cross section measurements of O2 with a resolution of 0.0008 nm in the 83.4, 91.7 and 108.5 nm regions at temperatures of 535 K and 295 K. The 6.65-m vertical off-plane Eagle spectrometer available at the Photon Factory, KEK, Tsukuba, Japan, was employed in the present study. The detailed temperature-dependent results of this work will be presented. This work is supported by NSF grant ATM-9710389 and ATM-0096761. [1] R. Meier, Space Sci. Rev. 58, 1 (1991). [2] R. Meier, Geophys. Res. Letters, 17, 1613 (1990). [3] R. Link, J.S. Evans, and G.R. Gladstone, J. Geophys. Res., 99, 2121 (1994). [4] D.D. Cleary, R.R. Meier, E.P. Gentieu, P.D. Feldman, and A.B. Christensen, J. Geophys. Res., 94, 17281 (1989). [5] K.F. Dymond, K.S. Wood, G.R. Carruthers, P.A. Bernhardt, R.P. McCoy, Eos Trans. AGU, 81(19), Spring Meet. Suppl., S338 (2000). [6] C.Y.R. Wu, T.S. Chien, G.S. Liu, D.L. Judge, J. Caldwell, J. Chem. Phys., 91, 272 (1989). [7] C.Y.R. Wu, T. Hung, D.L. Judge, T. Matsui, J. Geophys. Res., 105, 5329 (2000).

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