Frequency-stabilized cavity ring-down spectroscopy was used to study CO2 lineshapes in the (20013) ← (00001) band centered near 2.06 μm. Two rovibrational transitions were chosen for this study to measure non-Voigt collisional effects for air-broadened lines over the pressure range of 7 kPa–28 kPa. Lineshape analysis for both lines revealed evidence of simultaneous Dicke (collisional) narrowing and speed-dependent effects that would introduce biases exceeding 2% in the retrieved air-broadening parameters if not incorporated in the modeling of CO2 lineshapes. Additionally, correlations between velocity- and phase/state changing collisions greatly reduced the observed Dicke narrowing effect. As a result, it was concluded that the most appropriate line profile for modeling CO2 lineshapes near 2.06 μm was the correlated speed-dependent Nelkin-Ghatak profile, which includes all of the physical effects mentioned above and leads to a consistent set of line shape parameters that are linear with gas pressure.
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7 November 2014
Research Article|
November 03 2014
Observations of Dicke narrowing and speed dependence in air-broadened CO2 lineshapes near 2.06 μm
Thinh Q. Bui
;
Thinh Q. Bui
a)
1Division of Chemistry and Chemical Engineering,
California Institute of Technology
, Pasadena, California 91125, USA
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David A. Long;
David A. Long
a)
2Material Measurement Laboratory,
National Institute of Standards and Technology
, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
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Agata Cygan;
Agata Cygan
a)
3Institute of Physics, Faculty of Physics, Astronomy, and Informatics,
Nicolaus Copernicus University
, Grudziadzka 5, 87-100 Torun, Poland
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Vincent T. Sironneau;
Vincent T. Sironneau
2Material Measurement Laboratory,
National Institute of Standards and Technology
, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
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Daniel W. Hogan;
Daniel W. Hogan
1Division of Chemistry and Chemical Engineering,
California Institute of Technology
, Pasadena, California 91125, USA
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Priyanka M. Rupasinghe;
Priyanka M. Rupasinghe
1Division of Chemistry and Chemical Engineering,
California Institute of Technology
, Pasadena, California 91125, USA
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Roman Ciuryło;
Roman Ciuryło
3Institute of Physics, Faculty of Physics, Astronomy, and Informatics,
Nicolaus Copernicus University
, Grudziadzka 5, 87-100 Torun, Poland
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Daniel Lisak;
Daniel Lisak
3Institute of Physics, Faculty of Physics, Astronomy, and Informatics,
Nicolaus Copernicus University
, Grudziadzka 5, 87-100 Torun, Poland
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Mitchio Okumura
Mitchio Okumura
a)
1Division of Chemistry and Chemical Engineering,
California Institute of Technology
, Pasadena, California 91125, USA
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a)
Authors to whom correspondence should be addressed. Electronic addresses: [email protected]; [email protected]; [email protected]; and [email protected].
J. Chem. Phys. 141, 174301 (2014)
Article history
Received:
August 11 2014
Accepted:
October 15 2014
Citation
Thinh Q. Bui, David A. Long, Agata Cygan, Vincent T. Sironneau, Daniel W. Hogan, Priyanka M. Rupasinghe, Roman Ciuryło, Daniel Lisak, Mitchio Okumura; Observations of Dicke narrowing and speed dependence in air-broadened CO2 lineshapes near 2.06 μm. J. Chem. Phys. 7 November 2014; 141 (17): 174301. https://doi.org/10.1063/1.4900502
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