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The spectrum of N2 from 4,500 to 15,700 cm−1 revisited with PGOPHER

Research output: Contribution to journalArticle

  • Colin M. Western
  • Luke Carter-Blatchford
  • Patrick Crozet
  • Amanda J. Ross
  • Jérôme Morville
  • Dennis W. Tokaryk
Original languageEnglish
Pages (from-to)127-141
Number of pages15
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume219
Early online date2 Aug 2018
DOIs
DateAccepted/In press - 23 Jul 2018
DateE-pub ahead of print - 2 Aug 2018
DatePublished (current) - 1 Nov 2018

Abstract

Using a reference molecular atlas to ensure self-consistency of wavelength calibration is widespread practice. Boesch & Reiners (Astronomy & Astrophysics 582 A43 (2015)) reported a line list from a discharge of molecular nitrogen from 4500 to 11,000 cm−1 for this purpose. With a hollow-cathode discharge source, we have extended the experimental spectrum up to 15,700 cm−1, to include the range of Ti:sapphire lasers, since the density of N2 lines is greater than atomic atlases in common use. Recognizing that experimental conditions can vary, we have also analysed the spectra (comprising several B3Πg−A3Σu +, B 3Σu −B3Πg, and W3Δu −B3ΠgN2 bands) with standard Hamiltonians, so that any part of the discharge spectrum in the range 4,500–15,700 cm−1 can be simulated. Parameters are given to do this with the spectral simulation and analysis package PGOPHER. (C. Western, J. Quant. Spectrosc. Rad. Transf., 186, 221 (2016)). The analysis also included high-level ab initio calculations of potential energy curves, transition moments and spin-orbit coupling constants and these were used in preparing the model, extending the potential range of applicability. The results are available in a variety of formats to suit possible applications, including the experimental spectrum in ASCII, a detailed line list with positions and Einstein A coefficients, and a PGOPHER input file to synthesize the spectrum at selectable temperature and resolution.

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://doi.org/10.1016/j.jqsrt.2018.07.017 . Please refer to any applicable terms of use of the publisher.

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