Rotationally Resolved Fluorescence Emissions From The Coupled C4'(0) And b'(1) States Of N2

Details Rotationally Resolved Fluorescence Emissions From The Coupled C4'(0) And b'(1) States Of N2 Rotationally Resolved Fluorescence Emissions From The Coupled C4'(0) And b'(1) States Of N2

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.4907w&link_type=abstract

American Astronomical Society, DPS meeting #40, #49.07; Bulletin of the American Astronomical Society, Vol. 40, p.486

Astronomy and Astrophysics

Astronomy

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′ 1Σu+ à X 1Σg+ and the (1,v") bands of the b′ 1Σu+ à X 1Σg+ transitions of N2 in the vicinity of 95.8 nm. The new experimental apparatus allows us to study, for the first time, the rotationally resolved resonance fluorescence using a 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)àa branching transition and the subsequent cascade aàX (LBH) emission. The integrated fluorescence intensities of the c4'àX (0,0) band become saturated at N2 pressures higher than 0.16 mtorr. Multiple scattering processes apparently cause significant reduction in the c4'àX (0,0) emission rates while significantly enhances the emissions of c4'àX (0,v") with v"=0-2 at 2 mtorr. Strong perturbation and predissociation effects between the two 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 the dayglow of the Earth observed by the Far Ultraviolet Spectroscopic Explorer. We also plan to carry out the experiment at low temperatures so that the data to be obtained can be directly applicable to the characterization of the N2 emissions in the atmospheres of Titan and Pluto.

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