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Title:Adaptation To High Resolution Of An Algorithm To Retrieve The Instrument Line Shape Of A Fourier Transform Spectrometer
Author(s):Bertin, Thibault
Contributor(s):Vander Auwera, Jean
Subject(s):Lineshapes, collisional effects
Abstract:Fourier transform spectra include the non negligible contribution of the instrumental line shape (ILS) of the spectrometer, even at high resolution. To avoid biasing the information retrieved from these spectra, an accurate modeling of the actual ILS of the spectrometer is required. Several methods have been developed to retrieve the ILS from Fourier transform spectra of isolated lines at low pressure, either partially\footnote{D. Jacquemart, M. Chaboud, J. Quant. Spectrosc. Radiat. Transf. 119 (2013) 95--103.} or completely,\footnote{F. Hase, T. Blumenstock, C. Paton-Walsh, Appl. Opt. 38 (1999) 3417--3422.}$^{,}$\footnote{C. Bernardo, D.W.T. Griffith, J. Quant. Spectrosc. Radiat. Transf. 95 (2005) 141--150.} including its wavenumber dependence for the ACE-FTS.\footnote{C.D. Boone, P.F. Bernath, J. Quant. Spectrosc. Radiat. Transf. 230 (2019) 1--12.} The present method builds upon the work of Boone and Bernath.$^{5}$ It replaces the modeling of the wavenumber dependence of the ILS adapted to the ACE-FTS instrument, which turned out not to be appropriate for high resolution laboratory Fourier transform spectrometers, and accounts for the loss of information on the ILS resulting from the molecular line shape. The method, implemented in a simple python script, will be presented and its performance compared with \texttt{linefit}.$^{3}$ \vspace{24pt} \small \noindent \textit{\textbf{Acknowledgements}: T. Bertin thanks the FRIA (Belgium) for a PhD fellowship. This work is financially supported by the ``Fonds de la Recherche Scientifique''--FNRS (Belgium).}
Issue Date:2021-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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