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On the sensitivity of rotational O2 CARS thermometry to the Herman-Wallis factor

Bohlin, Alexis LU ; Nordström, Emil LU ; Bengtsson, Per-Erik LU and Marrocco, Michele LU (2012) In Journal of Raman Spectroscopy 43(5). p.599-603
Abstract
Contributions of vibrationrotation 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 HermanWallis (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 N2 and O2 CARS thermometry... (More)
Contributions of vibrationrotation 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 HermanWallis (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 N2 and O2 CARS thermometry leads to systematic overestimation of temperatures; on the order of 1.5% in the temperature range 300-2100K 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 (c) 2012 John Wiley & Sons, Ltd. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coherent anti-Stokes Raman scattering, laser spectroscopy, Herman-Wallis, factors, combustion diagnostics, thermometry
in
Journal of Raman Spectroscopy
volume
43
issue
5
pages
599 - 603
publisher
John Wiley & Sons
external identifiers
  • wos:000304149900003
  • scopus:84861347283
ISSN
1097-4555
DOI
10.1002/jrs.3147
language
English
LU publication?
yes
id
73b06599-b764-4a1a-a542-f2562147e790 (old id 2809508)
date added to LUP
2012-06-25 16:47:35
date last changed
2017-01-01 06:36:24
@article{73b06599-b764-4a1a-a542-f2562147e790,
  abstract     = {Contributions of vibrationrotation 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 HermanWallis (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 N2 and O2 CARS thermometry leads to systematic overestimation of temperatures; on the order of 1.5% in the temperature range 300-2100K 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 (c) 2012 John Wiley & Sons, Ltd.},
  author       = {Bohlin, Alexis and Nordström, Emil and Bengtsson, Per-Erik and Marrocco, Michele},
  issn         = {1097-4555},
  keyword      = {coherent anti-Stokes Raman scattering,laser spectroscopy,Herman-Wallis,factors,combustion diagnostics,thermometry},
  language     = {eng},
  number       = {5},
  pages        = {599--603},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Raman Spectroscopy},
  title        = {On the sensitivity of rotational O2 CARS thermometry to the Herman-Wallis factor},
  url          = {http://dx.doi.org/10.1002/jrs.3147},
  volume       = {43},
  year         = {2012},
}