Intensities of methane in the 3- to 5-um region revisited

L. Fejard; J. P. Champion; L. R. Brown; A. S. Pine

doi:10.1117/12.375370

25 January 2000 Intensities of methane in the 3- to 5-μm region revisited

L. Fejard, J. P. Champion, L. R. Brown, A. S. Pine

Proceedings Volume 4063, 13th Symposium and School on High-Resolution Molecular Spectroscopy; (2000) https://doi.org/10.1117/12.375370
Event: 13th Symposium and School on High-Resolution Molecular Spectroscopy, 1999, Tomsk, Russian Federation

Abstract

The present work is part of a comprehensive effort engaged with the analyses of the line positions of the isotopic species '2CH4 (Hilico et a]. - J. Mo]. Spectrosc. 168, 455 1994), '3CH4 (Jouvard et a]. - J. Mo]. Spectrosc. 150, 201 - 1991) and the recent global study of '2CH3D (Nikitin et a]. -Mo]. Struct. in press - 1999). The first global analysis of the intensities of the Pentad band system of methane '2CH4 (Lu, 113, 2v2, v2+v4 and 2v4) in the 3 to 5 imregion was published in 1983 by Pierre et a]. (J. Mo]. Spectrosc. 102, 344 - 1983) This study used line positions recorded with the FTS at Orsay (Guelachvili - Nouv. Rev. Opt. App]. 3, 31 7 - 1972) and intensity data taken from the AFGL compilation (Rothman - App]. Opt. 20, 791 - 1981). The reported rms was 12%. The experimental intensities were laser measurements of Dang-Nhu et a]. (J. IVIo]. Spectrosc. 77, 57- 1979) for the strongest allowed lines of 113combined with mainly grating data from Toth et a]. (App]. Opt. 20, 932 - 1981) for the weaker transitions. The same data were exploited again in a new analysis of the Pentad of methane published in 1994 by Hilico et a]. . The use of an improved theoretical model yielded an rrns of 8% and confirmed the need for more precise intensity measurements. Series of Fourier transform spectra were recorded at Kitt Peak National Observatory under various optical densities. These new data were combined in a simultaneous fit with measurements from laser spectrometry already reported in the literature (Pine -J. Opt. Soc. Am. 66, 97 1976 ; Dang-Nhu et a]. - 1979 ; Pine - J. Chem. Phys. 97, 773 - 1992 ; Pine - J.Q.S.R.T. 57, 157- 1997).

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L. Fejard, J. P. Champion, L. R. Brown, and A. S. Pine "Intensities of methane in the 3- to 5-μm region revisited", Proc. SPIE 4063, 13th Symposium and School on High-Resolution Molecular Spectroscopy, (25 January 2000); https://doi.org/10.1117/12.375370

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KEYWORDS

Fourier transforms

Information operations

Methane

Molybdenum

Laser spectroscopy

Molecules

Spectroscopy

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