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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/284782
- author
- Alwahabi, ZT
; Li, Zhongshan
LU
; Zetterberg, Johan
LU
and Aldén, Marcus
LU
- organization
- publishing date
- 2004
- 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
- 2016-04-01 16:30:54
- date last changed
- 2022-01-28 20:17:40
@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}},
keywords = {{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}},
doi = {{10.1016/j.optcom.2004.01.012}},
volume = {{233}},
year = {{2004}},
}