Predissociation Study of N2 in the 80-100 nm Region by Fluorescence Spectrometry

Details Predissociation Study of N2 in the 80-100 nm Region by Fluorescence Spectrometry Predissociation Study of N2 in the 80-100 nm Region by Fluorescence Spectrometry

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0283w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0283

Physics

0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0343 Planetary Atmospheres (5210, 5405, 5704), 0350 Pressure, Density, And Temperature

Scientific paper

Fluorescence excitation spectra (FES) and dispersed fluorescence spectra (DFS) produced through photoexcitation of N2 using synchrotron radiation in the spectral region between 80 and 100 nm have been obtained. In the FES study we observe features corresponding to excitation of absorption transitions from the ground electronic state to the b, b', cn (with n = 4-8), cn' (with n = 5-9), and c4'(v') (with v' = 0-8) states of N2. The relative fluorescence production cross-sections for the observed FES features are determined. No fluorescence has been produced through excitation of the most dominant absorption features of the b-X transition except for the (1,0), (5,0), (6,0), and (7,0) bands, in excellent agreement with recent lifetime measurements and theoretical calculations. In the DFS study the EUV resonance fluorescence of the (0,v") bands of the c4'-X and the (1,v") bands of the b′-X transitions of N2 has been observed by photon excitation of N2 in the vicinity of 95.8 nm. The c4′(0) emission intensities become saturated at a N2 pressure higher than ~ 0.1 mTorr. The multiple scattering processes apparently significant reduce the c4'(0,0) emission rates. The broadband emission features in the 105-130 nm region become progressively significant as the N2 pressure increases. Many broad emission features in the 105-130 nm region observed in the DFS have been assigned to the (1,v") progression for v" up to 11 of the b'-X transition. The present results provide important information for further unraveling of complicated and intriguing interactions among the excited electronic states of N2, and may be useful in the explanation of weak c4'(0,0), but significant c4'(0,v") features in the dayglow of the Earth observed by the FUSE Explorer. Detailed results will be presented. This research is based on work supported by NSF grant ATM-0096761.

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