Line shape parameters measurement and computations for self-broadened carbon dioxide transitions in the 30012←00001 and 30013←00001 bands, line mixing, and speed dependence

Predoi‐Cross, Adriana; Unni, A.V.; Liu, W.; Schofield, Ian; Holladay, C.; McKellar, A. R. W.; Hurtmans, Daniel

doi:10.1016/j.jms.2007.07.004

Cited by 58 publications

(37 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in the room temperature measurements of pure carbon dioxide transitions in the two Fermi bands of interest in the present study [2][3][4], the Voigt profiles do not model accurately the observed absorption profiles. Often a better representation of the observed profiles is obtained when line mixing effects are accounted for.…”

Section: Introductionmentioning

confidence: 60%

“…A total of 28 cold spectra were analyzed, with sample pressures ranging from 7 to 665 Torr (1 Torr= 133.322 Pa) and sample temperatures of 218, 235, or 259 K. The rotational gas temperatures reported in Table 1 were determined using selected line intensities from our pure gas, room temperature study of these two bands [4]. The estimated accuracy of the temperature determination is 70.5 K, with a further uncertainty of 70.5 K due to possible variations along the 5 m length of the cell.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…The uncertainty and inhomogeneity are greatest at the lowest temperature (218 K). The analysis also incorporated 18 room temperature spectra used in [4].…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…As in our room temperature study [4], the groups of spectra recorded at the same temperature were divided in sections of about 2-3 cm À 1 wide and analyzed using the multispectrum analysis software. The initial values for the fit parameters (other than line mixing coefficients) were taken from HITRAN 2004 database [15] (the line positions for the transition in our bands are the same as in the recent HITRAN 2008 database [16]).…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…Based on the conclusions of the room temperature spectroscopic studies of the 30013'00001 and 30012'00001 bands [2][3][4], we have accounted for line mixing effects in our line shape modeling. At elevated pressures inelastic collisions redistribute the molecules between adjacent energy levels, leading to a transfer of intensity from some parts of the spectrum to others.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

See 4 more Smart Citations

Measurement and computations for temperature dependences of self-broadened carbon dioxide transitions in the 30012←00001 and 30013←00001 bands

Predoi‐Cross

Liu

Murphy

et al. 2010

Journal of Quantitative Spectroscopy and Radiative Transfer

Self Cite

View full text Add to dashboard Cite

Using a Fourier transform spectrometer setup we have measured the self-broadened half width, pressure shift, and line asymmetry coefficients for transitions in the 30012'00001 and 30013'00001 vibrational bands of carbon dioxide for four different temperatures. A total of 46 pure CO 2 spectra were recorded at 0.008 and 0.009 cm À 1 resolution and at pressures varying from a few Torr to nearly an atmosphere. The individual spectral line profiles have been fitted by a Voigt profile and a speeddependent Voigt profile, to which we have added dispersion profiles to account for weak line mixing. A comparison of the sets of results obtained for each band showed no vibrational dependence of the broadening coefficients. The self-broadening and selfshift coefficients are compared to semiclassical calculations based on the RobertBonamy formalism and were found to be in good agreement. The line asymmetry results are compared to line mixing calculations based on the Energy Corrected Sudden (ECS) and Exponential Power Gap models.

show abstract

Section: Introductionmentioning

confidence: 60%

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…The uncertainty and inhomogeneity are greatest at the lowest temperature (218 K). The analysis also incorporated 18 room temperature spectra used in [4].…”

Section: Experimental Details and Resultsmentioning

confidence: 99%