High Resolution Fluorescence Spectrometry: The N2 and NI Emissions

Details High Resolution Fluorescence Spectrometry: The N2 and NI Emissions High Resolution Fluorescence Spectrometry: The N2 and NI Emissions

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4810w&link_type=abstract

American Astronomical Society, DPS meeting #42, #48.10; Bulletin of the American Astronomical Society, Vol. 42, p.971

Astronomy and Astrophysics

Astronomy

Scientific paper

Our goal is to investigate the complicated interactions among the excited electronic states of N2. In addition to high resolution absorption cross section measurements we have studied the J-dependent predissociation rates, cascade transitions and their branching ratios for several excited states of N2 at different pressure and temperature conditions. Dispersed fluorescence spectra (DFS) and fluorescence excitation spectra (FES) produced through photoexcitation of N2 using synchrotron radiation in the extreme ultraviolet region have been obtained. An ultrahigh resolution (0.0014 nm) spectrometer has been utilized to obtain a rotationally resolved FES experiment in spectral region between 80 and 100 nm. In the DFS experiments we have employed a 0.5-m and a 0.2-m spectrometer coupled with a position-sensitive-array detector to study the fluorescence spectra. Furthermore, we have also measured the fluorescence cross sections of several NI lines produced through photoexcitation of N2 in the 70-80 nm region.
We are currently carrying out the above N2 experiments at temperatures as low as 77 K so that the data can be applicable to the characterization of the N2 emissions in the atmospheres of Titan and Pluto. Detailed results will be presented. This research is based on work supported by NSF grant AST-0906158.

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