The European Physical Journal D

, Volume 42, Issue 1, pp 41–47

High resolution polarization spectroscopy and laser induced fluorescence of CO2 around 2μm

Authors

    • School of Chemical Engineering, University of Adelaide
  • J. Zetterberg
    • Division of Combustion PhysicsLund University
  • Z. S. Li
    • Division of Combustion PhysicsLund University
  • M. Aldén
    • Division of Combustion PhysicsLund University
Molecular Physics and Chemical Physics

DOI: 10.1140/epjd/e2006-00275-y

Cite this article as:
Alwahabi, Z., Zetterberg, J., Li, Z. et al. Eur. Phys. J. D (2007) 42: 41. doi:10.1140/epjd/e2006-00275-y

Abstract.

High resolution Infrared Polarisation Spectroscopy (IRPS) and Infrared Laser Induced Fluorescence (IRLIF) techniques were used to probe CO2/N2 binary gas mixture at atmospheric pressure and ambient temperature. The probed CO2 molecules were prepared by laser excitation to an overtone and combination ro-vibrational state (1201, J=15) of CO2, centred at 4988.6612 cm-1. IRPS and IRLIF line profiles were recorded for several CO2/N2 binary mixtures. The observed IRLIF line shapes have the expected Lorentzian form while the observed IRPS line shapes are narrower by a factor of two than those recorded with the IRLIF and appear to have a Lorentzian-cubed profile. The recorded line profiles provide measurements of the pressure-broadening coefficient directly at atmospheric pressure. The Full-Width-Half-Maxima (FWHM) pressure broadening coefficients are measured, based on IRLIF, to be 0.2174±0.0092 cm-1atm-1 and 0.1327 ±0.0077 cm-1atm-1 for self- and N2 collision broadening, respectively. The broadening coefficients obtained based on IRPS were measured to be ~8% larger than those obtained with IRLIF.

PACS.

42.25.Ja Polarization42.62.Fi Laser spectroscopy33.70.Jg Line and band widths, shapes, and shifts
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© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006