Laws of NonVoigt Absorption Line Shape Parameters gt ISMS 2017 gt Jonas Wilzewski TemperatureDependence of Line Shape Parameters gt 62117 DLRde Chart 1 Jonas Wilzewski ID: 633118
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Slide1
Experimental Study of Temperature-Dependence Laws of Non-Voigt Absorption Line Shape Parameters
> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17
DLR.de • Chart 1
Jonas Wilzewski1, Manfred Birk, Joep Loos, Georg WagnerRemote Sensing Technology InstituteGerman Aerospace Center (DLR), Germany1 Also at Ludwig-Maximilians-Universität, Physics Department, Munich, GermanySlide2
Behavior of non-Voigt parameters
with temperature remains unclear
Test of the commonly used power law for temperature-dependence:
comparison with other temperature lawsTest of lineshape theoryGhysels et al.1:
Motivation
> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17
DLR.de • Chart 2
1
Appl. Phys. B
123
, 124 (2017
) Slide3
CO
2
ν3 band
perturbed by N2Bruker IFS 125HR FT spectrometerSingle pass absorption cell, L=0.22 mT = 190, 200, 220, 240, 260, 280, 296, 310, 330 Kp = 10, 30, 100, 300, 1000 mbar2 different
mixing
ratios of CO2 – N2pure CO2 spectra to characterize ILS at each TMOPD: 1.2 m (1000, 300 mbar), 2.0 m (100 mbar), 2.5 m (30, 10 mbar)Experiment> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17DLR.de • Chart 3
9 Temperatures
5 Pressures
2 Mixing RatiosSlide4
Multispectrum fits in pressure
at each temperature
Instrumental Line Shape (ILS)characterized with LINEFIT
software by Hase et al.1Quadratic Speed-DependentHard Collision model implemented as in Ngo et al.2Fittedσ, S,
γ
0, γ2, δ0, δ2, νVC, Y0AnalysisDLR.de • Chart 41 Appl. Opt. 38
, 3417-3422 (1999)
2 JQSRT
134
, 105 (2014)
> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17Slide5
Power law
introduces
0.2% error on linewidths
on
average Results – γ0DLR.de • Chart 5> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17T = 296 KSlide6
Power law
works well for
γ2 γ
0 and γ2 exhibit different behavior in temperature:
Assuming
n(γ0) = n(γ2) leads to error of ~13% on average in γ2 (at 190 K) Results – γ2DLR.de • Chart 6> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17Slide7
Results – δ0
DLR.de • Chart
7
> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17Linear law recommended:
Slide8
Results – νVC
DLR.de • Chart
8
> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17Power law is suitablen(νVC)= 1.2 on average, close to theoretical
expectation
n(νVC)=1 (νVC = kT / 2πcmD | D~T2)11JQSRT 129, 89 (2013) Slide9
Evaluation of non-Voigt line shape
parameters over 140 K range
based on experiments with CO
2 perturbed by N2 Rotational quantum number dependence of non-Voigt temperature-dependencies accessibleErrors introduced by different temperature-dependence
models become quantifiableDistinct temperature-dependencies observed for γ0 and γ2Power law suitable to describe temperature-dependence of all parameters, except δ0SummaryDLR.de • Chart 9> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17Slide10
Results – Y0
DLR.de • Chart
10
> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17Power law better suited than linear lawSlide11
Error
contributions – example: γ
2DLR.de • Chart
11> ISMS 2017 > Jonas Wilzewski • Temperature-Dependence of Line Shape Parameters > 6/21/17