Measurements of Rotational Line f¡VValues of N2 in the 83.4 and 91.7 nm Regions: High-Resolution, High-Temperature

Details Measurements of Rotational Line f¡VValues of N2 in the 83.4 and 91.7 nm Regions: High-Resolution, High-Temperature Measurements of Rotational Line f¡VValues of N2 in the 83.4 and 91.7 nm Regions: High-Resolution, High-Temperature

Publishing date

Dec 2004

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa21a0339w&link_type=abstract

Journals

American Geophysical Union, Fall Meeting 2004, abstract #SA21A-0339

Science

Physics

Additional info 3

0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 0350 Pressure, Density, And Temperature

Type

Scientific paper

Abstract

We report the temperature-dependent ultrahigh-resolution photoabsorption spectra of N2 and O2 in the extreme ultraviolet (EUV) region, and their atmospheric modeling implications. One of the important issues regarding the interpretation of the NII 91.6 nm extreme ultraviolet airglow emissions of the Earth, Titan, and Triton, and the OII 83.4 nm EUV airglow emission of the Earth, is the effect of temperature on the atmospheric extinction due to absorption by N2 and O2. Since the temperature of the upper atmosphere of the Earth is typically in the 200 to 900 K range it is therefore important to know these molecular cross sections at such temperatures. We have carried out high resolution photoabsorption cross section measurements of N2 with a resolution of 0.0003 nm and 0.0008 nm in the 91.5-91.728 nm and the 83.31-83.45 nm regions at temperatures of 600, 535 and 295 K. The 6VOPE (6.65-m vertical off-plane Eagle spectrograph) spectrometer available at the Photon Factory, KEK, Tsukuba, Japan, was employed in the present study. The N2 absorption features in the 83.4 nm region mainly involve the (0,0) band of the c'6 - X transition and a weak (2,0) band of the c'4 - X transition. The rotational assignments have previously been given [Carroll and Yoshino, 1972]. Spectral perturbation effects in the c'6 - X transition have been observed at J (rotational quantum number) > 17. The weak (2,0) band of the c'4 - X transition further contributes to the spectral complexity. By integration over each individual absorption profile the rotational line f-values of N2 are determined for the above-mentioned spectral regions and experimental conditions. The detailed results will be presented. This research is based on work supported by NSF grant ATM-0096761.

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