Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa31a1605w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA31A-1605
Physics
0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0343 Planetary Atmospheres (5210, 5405, 5704), 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369)
Scientific paper
An ultrahigh resolution (0.0014 nm) spectrometer has been utilized to study the extreme ultraviolet resonance fluorescence of the (0,v") bands of the c4'-X and the (1,v") bands of the b'-X transitions of N2 in the vicinity of 95.8 nm. The new experimental apparatus allows us to obtain rotationally resolved resonance fluorescence excitation spectra using an ultra-bright undulator synchrotron radiation source. We have found that the c4'(0) state predominantly decays through resonance fluorescence to the ground state while the b'(1) state prefers the b'(1)-a branching transition and the subsequent cascade a-X (LBH) emission. The integrated fluorescence intensities of the c4'-X (0,0) band become saturated at N2 pressures higher than ~0.16 mtorr. Multiple scattering processes apparently cause significant reduction in the c4'-X (0,0) emission rates while significantly enhances the emissions of c4'-X (0,v") with v"=0-2 at ~2 mtorr. Strong perturbation and predissociation effects between the coupled states have been confirmed. The detailed results will be presented. The present results may be useful in the explanation of the important N2 features in dayglow of the Earth observed by the FUSE. We also plan to carry out the experiment at low temperatures to provide data that can be directly applicable to the characterization of the N2 emissions in the atmospheres of Titan and Pluto.
Fung Hok-Sum
Judge Darrell L.
Lee Yeonbae
Lin Yen-Chih
Lo Jen-Iu
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