Journal ArticleDOI
Empirical values of the ground state energies for methane transitions between 5500 and 6150 cm −1
Reads0
Chats0
TLDR
The variation of the measured strengths allows the energy of the lower state of the transition to be determined empirically using the temperature dependence of the methane partition function and the Boltzmann factor for the energy level populations.Abstract:
The strengths of more than 1600 lines of CH(4) have been measured in the spectral interval between 5500 and 6150 cm(-1) at room temperature and reduced temperatures. The variation of the measured strengths allows the energy of the lower state of the transition to be determined empirically using the temperature dependence of the methane partition function and the Boltzmann factor for the energy level populations. An error analysis, based on assumed errors in the strength and temperature measurements, is included. The average measured uncertainty in J is 0.2.read more
Citations
More filters
Journal ArticleDOI
The HITRAN 2008 molecular spectroscopic database
Laurence S. Rothman,Iouli E. Gordon,Yurii L. Babikov,A. Barbe,D. Chris Benner,Peter F. Bernath,Manfred Birk,Luca Bizzocchi,Vincent Boudon,Linda R. Brown,Alain Campargue,Kelly Chance,Edward A. Cohen,L. H. Coudert,V. M. Devi,Brian J. Drouin,André Fayt,Jean-Marie Flaud,Robert R. Gamache,Jeremy J. Harrison,Jean-Michel Hartmann,Christian Hill,Joseph T. Hodges,D. Jacquemart,Antoine Jolly,Julien Lamouroux,R. J. Le Roy,Gang Li,David A. Long,O.M. Lyulin,C.J. Mackie,Steven T. Massie,Semen Mikhailenko,Holger S. P. Müller,Olga V. Naumenko,Andrei Nikitin,Johannes Orphal,V.I. Perevalov,Agnes Perrin,E. R. Polovtseva,Charlotte Richard,Mary Ann H. Smith,Evgeniya Starikova,Keeyoon Sung,S.A. Tashkun,Jonathan Tennyson,Geoff Toon,Vl.G. Tyuterev,G. Wagner +48 more
TL;DR: The new HITRAN is greatly extended in terms of accuracy, spectral coverage, additional absorption phenomena, added line-shape formalisms, and validity, and molecules, isotopologues, and perturbing gases have been added that address the issues of atmospheres beyond the Earth.
Journal ArticleDOI
The 2009 edition of the GEISA spectroscopic database
N. Jacquinet-Husson,L. Crepeau,R. Armante,C. Boutammine,A. Chedin,N. A. Scott,C. Crevoisier,V. Capelle,C. Boone,N. Poulet-Crovisier,A. Barbe,Alain Campargue,D. Chris Benner,Yves Bénilan,Bruno Bézard,Vincent Boudon,Linda R. Brown,L. H. Coudert,Athena Coustenis,V. Dana,V. M. Devi,Sophie Fally,André Fayt,Jean-Marie Flaud,Aaron Goldman,Michel Herman,G. J. Harris,D. Jacquemart,Antoine Jolly,Isabelle Kleiner,Armin Kleinböhl,F. Kwabia-Tchana,Nina N. Lavrentieva,Nelly Lacome,Li-Hong Xu,O.M. Lyulin,J.-Y. Mandin,Arthur G. Maki,Semen Mikhailenko,Charles E. Miller,T.P. Mishina,Nasser Moazzen-Ahmadi,Holger S. P. Müller,Andrei Nikitin,Johannes Orphal,V.I. Perevalov,Agnes Perrin,Douglas T. Petkie,Adriana Predoi-Cross,Curtis P. Rinsland,John Remedios,Maud Rotger,Mary Ann H. Smith,Keeyoon Sung,S.A. Tashkun,Jonathan Tennyson,Robert A. Toth,Ann Carine Vandaele,J. Vander Auwera +58 more
TL;DR: The GEISA database as mentioned in this paper is a computer-accessible system comprising three independent sub-databases devoted, respectively, to: line parameters, infrared and ultraviolet/visible absorption cross-sections, microphysical and optical properties of atmospheric aerosols.
Journal ArticleDOI
Methane line parameters in the HITRAN2012 database
Linda R. Brown,Keeyoon Sung,D. C. Benner,V. M. Devi,Vincent Boudon,Tony Gabard,Ch. Wenger,Alain Campargue,O. Leshchishina,Samir Kassi,Didier Mondelain,L. Wang,Ludovic Daumont,L. Régalia,Michael Rey,X. Thomas,Vl.G. Tyuterev,O.M. Lyulin,Andrei Nikitin,Hans-Martin Niederer,Sieghard Albert,Sigurd Bauerecker,Martin Quack,James J. O'Brien,Iouli E. Gordon,Laurence S. Rothman,Hiroyuki Sasada,Athena Coustenis,Mary Ann H. Smith,Tucker Carrington,Xiao-Gang Wang,Arlan W. Mantz,P. T. Spickler +32 more
TL;DR: The compilation of methane molecular line parameters was updated to include new global analyses and measurements for 12CH4, 13CH4 and 12CH3D in this paper, which increased the number of lines in the database from 290,091 lines in HITRAN2008 to 468,013 lines.
Journal ArticleDOI
Methane Line Parameters in HITRAN
Linda R. Brown,D. Chris Benner,Jean-Paul Champion,V. M. Devi,L. Féjard,Robert R. Gamache,Tony Gabard,J.C. Hilico,Bruno Lavorel,Michel Loete,G.Ch. Mellau,Andrei Nikitin,A. S. Pine,Adriana Predoi-Cross,C.P. Rinsland,O. Robert,Robert L. Sams,Mary Ann H. Smith,S.A. Tashkun,Vladimir G. Tyuterev +19 more
TL;DR: Two editions of the methane line parameters (line positions, intensities and broadening coefficients) available from HITRAN in 2000 and 2001 are described in this paper, where the spectral interval covered was the same (from 0.01 to 6184.5 cm −1 ).
Journal ArticleDOI
Pressure broadening in the 2ν 3 band of methane and its implication on atmospheric retrievals
Christian Frankenberg,Thorsten Warneke,André Butz,Ilse Aben,Frank Hase,Peter Spietz,Linda R. Brown +6 more
TL;DR: In this article, a multispectrum nonlinear constrained least squares approach based on Optimal Estimation was applied to derive the spectroscopic parameters by simultaneously fitting laboratory spectra at different ambient pressures assuming a Voigt line-shape.
References
More filters
Journal ArticleDOI
The ground state of methane 12CH4 through the forbidden lines of the ν3 band
TL;DR: In this article, the ground state energies of the ν3 band of methane, 12CH4, were determined using combination difference relations using pairs of transitions having the same upper state energy level (forbidden-allowed and forbidden-forbidden pairs were used), with uncertainties of about 0.001 cm−1.
Journal ArticleDOI
Measured line positions and strengths of methane between 5500 and 6180 cm(-1).
TL;DR: The positions and strengths of more than 2000 methane absorption lines stronger than 1.0 x 10(-4) cm(-2) atm (-1) have been measured in the 5500-6180-cm(-1) spectral region.
Journal ArticleDOI
On the rotational partition function for tetrahedral molecules
TL;DR: In this article, a rigorous calculation of the quantum-mechanical rotational partition function for tetrahedral XY4 molecules yields Qr = ( 1 12 )(2IY + 1)4π 1 2 α- 3 2 exp(α/4), where IY is the spin of the Y nucleus, and α ≡ Bhc/kT.
Journal ArticleDOI
Strengths and lorentz broadening coefficients for spectral lines in the ν3 and ν2 + ν4 bands of 12CH4 and 13CH4
TL;DR: In this paper, the authors measured spectral lines in the ν3 and ν2 + ν4 bands of 12CH4 and 13CH4 from 2870-2883 cm−1 using a tunable diode laser spectrometer.
Journal ArticleDOI
Self-broadened widths and absolute strengths of 12CH4 lines in the 1310–1370 cm-1 region
J. Ballard,W.B. Johnston +1 more
TL;DR: In this article, the authors measured the self-broadened widths and absolute strength of 12CH4 lines in the 1310-1370 cm-1 spectral region using Fourier transform absorption spectroscopy with a 0.003 cm 1 resolution.
Related Papers (5)
The HITRAN 2008 molecular spectroscopic database
Laurence S. Rothman,Iouli E. Gordon,Yurii L. Babikov,A. Barbe,D. Chris Benner,Peter F. Bernath,Manfred Birk,Luca Bizzocchi,Vincent Boudon,Linda R. Brown,Alain Campargue,Kelly Chance,Edward A. Cohen,L. H. Coudert,V. M. Devi,Brian J. Drouin,André Fayt,Jean-Marie Flaud,Robert R. Gamache,Jeremy J. Harrison,Jean-Michel Hartmann,Christian Hill,Joseph T. Hodges,D. Jacquemart,Antoine Jolly,Julien Lamouroux,R. J. Le Roy,Gang Li,David A. Long,O.M. Lyulin,C.J. Mackie,Steven T. Massie,Semen Mikhailenko,Holger S. P. Müller,Olga V. Naumenko,Andrei Nikitin,Johannes Orphal,V.I. Perevalov,Agnes Perrin,E. R. Polovtseva,Charlotte Richard,Mary Ann H. Smith,Evgeniya Starikova,Keeyoon Sung,S.A. Tashkun,Jonathan Tennyson,Geoff Toon,Vl.G. Tyuterev,G. Wagner +48 more