Analysis of the Ro-vibronic Structure of N2 in the 91.6 nm Region

Details Analysis of the Ro-vibronic Structure of N2 in the 91.6 nm Region Analysis of the Ro-vibronic Structure of N2 in the 91.6 nm Region

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa22a0720w&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA22A-0720

Physics

0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0325 Evolution Of The Atmosphere, 0335 Ion Chemistry Of The Atmosphere (2419, 2427), 0355 Thermosphere: Composition And Chemistry

Scientific paper

We have carried out high resolution absorption cross section measurements of N2 with a resolution of 0.0003 nm in the 91.6 nm region at temperatures of 650, 555, and 295 K. The 6.65-m vertical off-plane Eagle spectrograph/spectrometer available at the Photon Factory, KEK, Tsukuba, Japan, was employed in the present study. Absorption features in this region mainly involve the (11,0) band of the b 1Au-X 1Eg+ transition under room temperature conditions. Additional intense ro-vibronic lines in the spectral region at elevated temperatures are found to be due to ro-vibronic transitions involving high rotational quantum numbers from the (12,0) band of the b 1Au-X 1Eg+, the (8,0) band of the b' 1Eu+-X 1Eg+, and the (2,0) band of the o3 1Au-X 1Eg+ transitions. A new hot band with a well-defined bandhead appears in the short wavelength region of the (11,0) band of the b-X transition at high temperatures. The spectroscopic analysis and identification of this temperature-dependent absorption feature will be presented. This work is supported by NSF grant ATM-9800564.

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