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Multispectrum fit of non-Voigt lineshape in the H2O v2 band

Loos, Joep and Birk , Manfred and Wagner, Georg and Hase, Frank and Dubravica, Darko and Palm, Mathias and Sadeghi, Alireza (2013) Multispectrum fit of non-Voigt lineshape in the H2O v2 band. In: 23rd Colloquium on High Resolution Molecular Spectroscopy. HRMS 2013, 25.-30. Aug. 2013, Budapest, Ungarn.

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Abstract

A new fitting tool for analysis of multiple molecular absorption spectra utilizing a microwindow-based line-by-lineapproach has been developed. Its capabilities include the choice of numerous different line shape models, from a simple Voigt to more sophisticated models like a speed-dependent Galatry including line-mixing. A comfortable manual mode as well as a fully automatic mode have been implemented including various quality assessment procedures like the monitoring of correlation coefficients or the supply of useful information e.g. needed for file cuts (single spectrum residuals). As a first application the new tool is used to re-analyze water vapor absorption spectra in the 1250-1750 cm range. The measurements include pure water as well as water/air-mixture measurements and cover a wide range of column densities. The total air pressure and partial pressure ranges were 50-1000 mb and 0.001-5 mb, respectively. Whereas the original analysis was based on single spectrum fits applying the Voigt procedure, in the present multispectrum fit the speed-dependent Voigt lineshape was used. The advantages of a multispectral analyis approach as well as the need for consideration of narrowing effects is illustrated by the presentation of differences in residuals as well as resulting line parameters for selected transitions. As indicated in opaque as well as non opaque lines could be fitted with the speed-dependent Voigt while the pure Voigt yields to narrow opaque lines.

Document Type:Conference or Workshop Item (Poster)
Title:Multispectrum fit of non-Voigt lineshape in the H2O v2 band
Authors:
AuthorsInstitution or Email of Authors
Loos, Joepjoep.loos@dlr.de
Birk , Manfred manfred.birk@dlr.de
Wagner, Georg georg.wagner@dlr.de
Hase, FrankKIT
Dubravica, DarkoKIT
Palm, MathiasUni Bremen, IUP
Sadeghi, AlirezaUni bremen, IUP
Date:August 2013
Journal or Publication Title:23rd Colloquium on High Resolution Molecular Spectroscopy
Refereed publication:No
In ISI Web of Science:No
Status:Published
Keywords:multispectrum fit water vapour infrared absorption lineshape
Event Title:HRMS 2013
Event Location:Budapest, Ungarn
Event Type:international Conference
Event Dates:25.-30. Aug. 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Experimental Methods
Deposited By: Joep Loos
Deposited On:02 Oct 2013 17:04
Last Modified:02 Oct 2013 17:05

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