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Observations of Dicke narrowing and speed dependence in air-broadened CO2 lineshapes near 2.06 µm.
Bui, Thinh Q; Long, David A; Cygan, Agata; Sironneau, Vincent T; Hogan, Daniel W; Rupasinghe, Priyanka M; Ciurylo, Roman; Lisak, Daniel; Okumura, Mitchio.
Afiliação
  • Bui TQ; Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
  • Long DA; Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.
  • Cygan A; Institute of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland.
  • Sironneau VT; Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.
  • Hogan DW; Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
  • Rupasinghe PM; Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
  • Ciurylo R; Institute of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland.
  • Lisak D; Institute of Physics, Faculty of Physics, Astronomy, and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland.
  • Okumura M; Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
J Chem Phys ; 141(17): 174301, 2014 Nov 07.
Article em En | MEDLINE | ID: mdl-25381508
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.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2014 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2014 Tipo de documento: Article