University of Illinois Urbana-Champaign

The High-resolution Extreme-ultraviolet Spectrum Of N2 By Electron Impact

Heays, Alan

Content Files
FE03_Abstract.pdf
FE03_Abstract.txt
FE03_Presentation.pdf

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https://hdl.handle.net/2142/50846

Description

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.
Issue Date
2014-06-20
Keyword(s)
Planetary atmospheres
Date of Ingest
  • 2014-09-17T16:55:09Z
  • 2015-04-14T18:40:39Z
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.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
English
Permalink
http://hdl.handle.net/2142/50846
DOI
https://doi.org/10.15278/isms.2014.FE03
Copyright and License Information
Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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Abstracts & Presentations - 2014 International Symposium on Molecular Spectroscopy PRIMARY