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Title:The High-resolution Extreme-ultraviolet Spectrum Of N2 By Electron Impact
Author(s):Heays, Alan
Contributor(s):Gibson, Stephen; Lewis, Brenton R.; Aguilar, Alejandro; Ajello, Joe M.
Subject(s):Planetary atmospheres
Abstract:We have recorded high-resolution (FWHM = 0.2\,\AA) extreme-ultraviolet (EUV, 800--1350\,\AA) laboratory emission spectra of molecular nitrogen excited by 20 and 100\,eV electron impact under mostly optically thin conditions. From these, emission cross sections were determined for a total of 491 features arising from N$_2$ electronic-vibrational transitions and atomic N\,I and N\,II multiplets. Molecular emission was observed from those excited levels which are not completely predissociative and to ground-state vibrational levels as high as $v=17$. The frequently-blended molecular emission bands were disentangled with the aid of a coupled-channels model of excited N$_2$ states that includes the strong coupling between valence and Rydberg electronic states and the effects of predissociation. The observed emission bands probe a large range of vibrational motion so that internuclear-distance-dependent electronic transition moments could be deduced experimental. The coupled-channels model could then be used to predict the emission cross sections of unobserved bands and those that are optically thick in the experimental spectra. The electron-impact-induced fluorescence measurements and model were compared with Cassini UVIS observations of emissions from Titan's upper atmosphere.
Issue Date:2014-06-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Heays, A.; Gibson, S.; Lewis, B.R.; Aguilar, A.; Ajello, J.M. THE HIGH-RESOLUTION EXTREME-ULTRAVIOLET SPECTRUM OF N2 BY ELECTRON IMPACT. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.FE03
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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