Linewidth modelling of C2H2N2 mixtures tested by rotational CARS measurements

• Published in: Journal of Raman spectroscopy Vol. 37; no. 6; pp. 647 - 654
• Main Authors: Buldyreva, J., Bonamy, J., Weikl, M. C., Beyrau, F., Seeger, T., Leipertz, A., Vestin, F., Afzelius, M., Bood, J., Bengtsson, P.-E.
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.06.2006
• Subjects: acetylene-nitrogen mixture; Cars; Coherent scattering; collisional linewidth; Inclusions; interbranch interference; Mathematical models; Raman scattering; Rotational; rotational CARS thermometry; semi-classical computation; Spectra; Spectral lines; temperature evaluation
• ISSN: 0377-0486; 1097-4555
• DOI: 10.1002/jrs.1491

The acetylene–nitrogen system is investigated in a combined theoretical and experimental effort in view of its thermometry applications. Accurate values of the rotational Raman linewidths of acetylene are of crucial importance for the computation of spectra from rotational coherent anti‐Stokes Raman scattering (CARS) used for temperature and concentration evaluations. Since the direct measurements of these linewidths are not available, they are rigorously calculated by a semi‐classical Robert–Bonamy formalism employing exact trajectories. The computed linewidths are used as input parameters in the theoretical spectra simulation, which is also improved by the inclusion of an interbranch interference with coherent Stokes Raman scattering (CSRS). These theoretical spectra are used to evaluate the temperature from experimental CARS spectra of acetylene‐nitrogen mixtures recorded in the pressure range 0.1–0.6 MPa. The new linewidths (NLWs) and the CSRS interference inclusion result in a clear improvement of spectral fitting as well as in reasonable values of evaluated temperatures. Copyright © 2006 John Wiley & Sons, Ltd.