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Infrared polarization spectroscopy of CO2 at atmospheric pressure

Alwahabi, ZT; Li, Zhongshan LU ; Zetterberg, Johan LU and Aldén, Marcus LU (2004) In Optics Communications 233(4-6). p.373-381
Abstract
Polarisation spectroscopy (PS) was used to probe CO2 gas concentration in a CO2/N-2 binary mixture at atmospheric pressure and ambient temperature. The CO2 molecules were probed by a direct laser excitation to an overtone and combination vibrational state. The tuneable narrow linewidth infrared laser radiation at 2 mum was obtained by Raman shifting of the output from a single-longitudinal-mode pulsed alexandrite laser-system to the second Stokes component in a H, gas cell. Infrared polarisation spectroscopy (IRPS) and time-resolved infrared laser-induced fluorescence (IRLIF) spectra were collected. A linear dependence of the IRPS signal on the CO2 mole fraction has been found. This indicates that the IRPS signal is only weakly affected by... (More)
Polarisation spectroscopy (PS) was used to probe CO2 gas concentration in a CO2/N-2 binary mixture at atmospheric pressure and ambient temperature. The CO2 molecules were probed by a direct laser excitation to an overtone and combination vibrational state. The tuneable narrow linewidth infrared laser radiation at 2 mum was obtained by Raman shifting of the output from a single-longitudinal-mode pulsed alexandrite laser-system to the second Stokes component in a H, gas cell. Infrared polarisation spectroscopy (IRPS) and time-resolved infrared laser-induced fluorescence (IRLIF) spectra were collected. A linear dependence of the IRPS signal on the CO2 mole fraction has been found. This indicates that the IRPS signal is only weakly affected by the molecular collisions and that the inter- and intra- molecular energy transfer processes do not strongly influence the molecular alignment at the time scale of the measurements. Thus IRPS holds great potential for quantitative instantaneous gas concentration diagnostics in general. This is especially important for molecules which do not posses an accessible optical transition such as CO, CO2 and N2O. In addition, an accurate experimental method to measure the extinction ratio of the IR polarisers employed in this study has been developed and applied. With its obvious merits as simplicity, easy alignment and high accuracy, the method can be generalized to all spectral regions, different polarisers and high extinction ratios. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
polarisation spectroscopy, infrared spectroscopy
in
Optics Communications
volume
233
issue
4-6
pages
373 - 381
publisher
Elsevier
external identifiers
  • wos:000220169500018
  • scopus:1442332043
ISSN
0030-4018
DOI
10.1016/j.optcom.2004.01.012
language
English
LU publication?
yes
id
9a03f76f-b502-459f-99f7-22d4d0b1f540 (old id 284782)
date added to LUP
2007-10-16 12:18:24
date last changed
2017-01-01 07:07:28
@article{9a03f76f-b502-459f-99f7-22d4d0b1f540,
  abstract     = {Polarisation spectroscopy (PS) was used to probe CO2 gas concentration in a CO2/N-2 binary mixture at atmospheric pressure and ambient temperature. The CO2 molecules were probed by a direct laser excitation to an overtone and combination vibrational state. The tuneable narrow linewidth infrared laser radiation at 2 mum was obtained by Raman shifting of the output from a single-longitudinal-mode pulsed alexandrite laser-system to the second Stokes component in a H, gas cell. Infrared polarisation spectroscopy (IRPS) and time-resolved infrared laser-induced fluorescence (IRLIF) spectra were collected. A linear dependence of the IRPS signal on the CO2 mole fraction has been found. This indicates that the IRPS signal is only weakly affected by the molecular collisions and that the inter- and intra- molecular energy transfer processes do not strongly influence the molecular alignment at the time scale of the measurements. Thus IRPS holds great potential for quantitative instantaneous gas concentration diagnostics in general. This is especially important for molecules which do not posses an accessible optical transition such as CO, CO2 and N2O. In addition, an accurate experimental method to measure the extinction ratio of the IR polarisers employed in this study has been developed and applied. With its obvious merits as simplicity, easy alignment and high accuracy, the method can be generalized to all spectral regions, different polarisers and high extinction ratios.},
  author       = {Alwahabi, ZT and Li, Zhongshan and Zetterberg, Johan and Aldén, Marcus},
  issn         = {0030-4018},
  keyword      = {polarisation spectroscopy,infrared spectroscopy},
  language     = {eng},
  number       = {4-6},
  pages        = {373--381},
  publisher    = {Elsevier},
  series       = {Optics Communications},
  title        = {Infrared polarization spectroscopy of CO2 at atmospheric pressure},
  url          = {http://dx.doi.org/10.1016/j.optcom.2004.01.012},
  volume       = {233},
  year         = {2004},
}