Publication Abstracts

Thibault et al. 2014

Thibault, F., R.Z. Martínez, D. Bermejo, S.V. Ivanov, O.G. Buzykin, and Q.-C. Ma, 2014: An experimental and theoretical study of nitrogen-broadened acetylene lines. J. Quant. Spectrosc. Radiat. Transfer, 142, 17-24, doi:10.1016/j.jqsrt.2014.03.009.

We present experimental nitrogen-broadening coefficients derived from Voigt profiles of isotropic Raman Q-lines measured in the ν2 band of acetylene (C2H2) at 150 K and 298 K, and compare them to theoretical values obtained through calculations that were carried out specifically for this work. Namely, full classical calculations based on Gordon's approach, two kinds of semi-classical calculations based on Robert-Bonamy method as well as full quantum dynamical calculations were performed. All the computations employed exactly the same ab initio potential energy surface for the C2H2-N2 system which is, to our knowledge, the most realistic, accurate and up-to-date one. The resulting calculated collisional half-widths are in good agreement with the experimental ones only for the full classical and quantum dynamical methods. In addition, we have performed similar calculations for IR absorption lines and compared the results to bibliographic values. Results obtained with the full classical method are again in good agreement with the available room temperature experimental data. The quantum dynamical close-coupling calculations are too time consuming to provide a complete set of values and therefore have been performed only for the R(0) line of C2H2. The broadening coefficient obtained for this line at 173 K and 297 K also compares quite well with the available experimental data. The traditional Robert-Bonamy semi-classical formalism, however, strongly overestimates the values of half-width for both Q- and R-lines. The refined semi-classical Robert-Bonamy method, first proposed for the calculations of pressure broadening coefficients of isotropic Raman lines, is also used for IR lines. By using this improved model that takes into account effects from line coupling, the calculated semi-classical widths are significantly reduced and closer to the measured ones.

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BibTeX Citation

  author={Thibault, F. and Martínez, R. Z. and Bermejo, D. and Ivanov, S. V. and Buzykin, O. G. and Ma, Q.-C.},
  title={An experimental and theoretical study of nitrogen-broadened acetylene lines},
  journal={J. Quant. Spectrosc. Radiat. Transfer},

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RIS Citation

ID  - th08100s
AU  - Thibault, F.
AU  - Martínez, R. Z.
AU  - Bermejo, D.
AU  - Ivanov, S. V.
AU  - Buzykin, O. G.
AU  - Ma, Q.-C.
PY  - 2014
TI  - An experimental and theoretical study of nitrogen-broadened acetylene lines
JA  - J. Quant. Spectrosc. Radiat. Transfer
VL  - 142
SP  - 17
EP  - 24
DO  - 10.1016/j.jqsrt.2014.03.009
ER  -

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