On the sensitivity of rotational O

Alexis Bohlin, Emil Nordström, Per-Erik Bengtsson, Michele Marrocco

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Contributions of vibration-rotation interaction to line intensities of pure rotational coherent anti-Stokes Raman scattering (CARS) of oxygen are here considered in the perspective of what was remarked by us recently for nitrogen. The interaction is conventionally evaluated by means of the so-called Herman-Wallis (HW) factor, the need of which is conceptually clear but the theoretical expression is debatable, as shown in the literature of this field. In this work, the various solutions for the anisotropic HW factor of pure rotational Raman transitions are compared in light of the implications for the corresponding CARS spectral line intensities. The results show that neglecting the use of HW factors in rotational N2and O2CARS thermometry leads to systematic overestimation of temperatures; on the order of 1.5% in the temperature range 300-2100 K in comparison with the use of the most plausible HW factors. The results also suggest that, in general, oxygen is more sensitive than nitrogen to the HW correction, and in particular, different S-branch HW expressions for oxygen are responsible for thermometric uncertainties between 0.5% and 1% at flame temperatures. Copyright © 2012 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)599 - 603
Number of pages5
JournalJournal of Raman Spectroscopy
Issue number5
Publication statusPublished - May 2012


All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Spectroscopy

Cite this

Bohlin, A., Nordström, E., Bengtsson, P-E., & Marrocco, M. (2012). On the sensitivity of rotational O. Journal of Raman Spectroscopy, 43(5), 599 - 603. https://doi.org/10.1002/jrs.3147