Adaptation To High Resolution Of An Algorithm To Retrieve The Instrument Line Shape Of A Fourier Transform Spectrometer

Bertin, Thibault

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https://hdl.handle.net/2142/111280 Copy

Description

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

Issue Date

2021-06-22

Keyword(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).}

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111280

DOI

10.15278/isms.2021.TM06

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