Measurements and theoretical calculations of self-broadening and self-shift coefficients in the ν2 band of CH3D

Predoi‐Cross, Adriana; Hambrook, Kyle; Brawley-Tremblay, Marco; Bouanich, Jean-Pierre; Devi, V. Malathy; Benner, D. Chris; Brown, Linda R.

doi:10.1016/j.jms.2005.08.005

Cited by 22 publications

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References 31 publications

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“…In this study we report the first experimental measurements of air-broadening and air-induced This paper is a continuation of our study of spectroscopic line parameters in the ν 2 band of CH 3 D [8][9][10] …”

Section: Introductionmentioning

confidence: 79%

“…The experimental conditions for the self-broadened spectra have been reported in Ref. 8. In Table 1 we present only the experimental conditions for the air-broadened spectra used in this study.…”

Section: Methodsmentioning

confidence: 99%

“…

ABSTRACTIn this study we report the first experimental measurements of air-broadening and air-induced This paper is a continuation of our study of spectroscopic line parameters in the ν 2 band of CH 3 D [8][9][10]

EXPERIMENTAL DETAILSThe seventeen pure gas and air-broadened absorption spectra used in this work were recorded at an unapodized resolution of 0.0056 cm -1 using the McMath-Pierce Fourier transform spectrometer (FTS) of the National Solar Observatory (NSO) on Kitt Peak, Arizona. The experimental conditions for the self-broadened spectra have been reported in Ref.

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mentioning

confidence: 91%

“…We have compared our measurement results with calculated air-broadening and air-pressure shift coefficients based on our CH 3 D-N 2 and CH 3 D-O 2 calculations [9,10]. The theoretical broadening and pressure shift coefficients were computed using our calculated parameters for CH 3 D-N 2 and CH 3 D-O 2 mixtures reported in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…9 and 10. The theoretical broadening and shift parameters in CH 3 D-N 2 [9] and CH 3 D-O 2 [10] mixtures are calculated using the semiclassical formulation of Robert and Bonamy [22].…”

Section: Introductionmentioning

confidence: 99%

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Experimental air-broadened line parameters in the\bm{ u}\textsubscript band of CH\textsubscriptD

Predoi‐Cross

Brawley-Tremblay²,

Povey³

et al. 2007

Can. J. Phys.

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In this study we report the first experimental measurements of air-broadening and air-induced This paper is a continuation of our study of spectroscopic line parameters in the ν 2 band of CH 3 D [8][9][10] EXPERIMENTAL DETAILSThe seventeen pure gas and air-broadened absorption spectra used in this work were recorded at an unapodized resolution of 0.0056 cm -1 using the McMath-Pierce Fourier transform spectrometer (FTS) of the National Solar Observatory (NSO) on Kitt Peak, Arizona. The experimental conditions for the self-broadened spectra have been reported in Ref.8. In Table 1 we present only the experimental conditions for the air-broadened spectra used in this study.Three absorption cells with path lengths of 10.2, 25 and 150 cm were used in the experiments.The spectra covering the 2048-2318 cm -1 were simultaneously fit using a multispectrum nonlinear least-squares procedure [23]. Using this analysis tool we were able to combine spectra 5 recorded with low pressures of 98% pure CH 3 D, self-broadened spectra and lean mixtures (~1%)of CH 3 D in air in a single non-linear least-squares solution. This methodology avoids having to give highly accurate input values for line intensities, self-broadening and self-induced pressure shifts. Instead, these parameters are determined from the pure gas spectra during the multispectrum fit. The experimental setup and data reduction methods were described in detail in our study to self-broadening and self-induced pressure shifts of CH RESULTS AND DISCUSSIONThe CH 3 D absorption spectra were analyzed using a multispectrum analysis software The air-broadening coefficients and air-pressure induced shift coefficients for CH 3 D transitions in the ν 2 band retrieved from our multispectrum analysis are presented in Table 2. The errors quoted in parentheses represent two standard deviation uncertainties in the measured quantities in units of the last quoted digit. These errors represent twice the uncertainties as obtained from the multispectrum least-squares fits. By reporting twice the standard deviation uncertainties we hope to take into account any systematic errors arising from other sources such as calibration standards, pressure and temperature determinations and mixing ratio uncertainties are difficult to asses.The air-broadening coefficients are given in units of cm −1 atm −1 at 296 K. For each transition we list the line center positions retrieved from the fits (in cm −1 ) and the transitions quantum numbers. In our analysis we have not applied any temperature corrections to the measured pressure-shift coefficients. Hence, the pressure-shift coefficients listed in Table 2 7 correspond to values at the mean temperature (298 ± 2 K) at which the spectra were recorded. A small temperature correction was applied to the air-broadening coefficients using the temperature dependence coefficients reported in the HITRAN database. We present our results arranged in groups of Q P-, Q Q-, and Q R-branches. Within each branch, the results are arranged separately for the A-an...

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Section: Introductionmentioning

confidence: 79%

Section: Methodsmentioning

confidence: 99%

“…

…”

mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

“…9 and 10. The theoretical broadening and shift parameters in CH 3 D-N 2 [9] and CH 3 D-O 2 [10] mixtures are calculated using the semiclassical formulation of Robert and Bonamy [22].…”

Section: Introductionmentioning

confidence: 99%

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