J/ApJ/662/750 ν9 fundamental band of ethane (Vander+, 2007)
Toward an accurate database for the 12 µm region of the ethane spectrum.
Vander Auwera J., Moazzen-ahmadi N., Flaud J.-M.
<Astrophys. J., 662, 750-757 (2007)>
=2007ApJ...662..750V 2007ApJ...662..750V
ADC_Keywords: Atomic physics
Keywords: astronomical data bases: miscellaneous - infrared: general -
line: formation - molecular data - techniques: spectroscopic
Abstract:
The ν9 fundamental band of ethane occurs in the 12um region. It is
the strongest band of ethane in a terrestrial window in the thermal
infrared and is commonly used to determine ethane's abundance in the
atmospheres of the Jovian planets and comets and to determine their
temperature. Precise and accurate absolute intensities of this band
are crucial for correct interpretation of recent Cassini observations
of ethane spectra in the atmospheres of Saturn and Titan, as well as
of Michelson Interferometer for Passive Atmospheric Sounding (MIPAS)
observations in the terrestrial atmosphere. Using a spectrum of the
ν9 band of ethane recorded at 278K at the Pacific Northwest
National Laboratory, we show that the line parameters available in the
HITRAN and GEISA databases do not allow reproduction of the
experimental data to within their accuracy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 100 21607 *Content of linelist "LIST 3"
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Note on table4.dat: formatted according to the 100-character records of the
1986 through 2001 editions of the HITRAN database (See details in
Rothman, et al. 2005, J. Quant. Spectrosc. Radiat. Transfer, 96, 139)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [271] HITRAN isotopologue number of 12C2H6
4- 15 F12.6 cm-1 nu [706.6,961.2] Line frequency (vacuum wavenumber)
16- 25 E10.3 cm sigij Integrated absorption cross section at 296K (1)
36- 40 F5.4 --- gamAir Air-broadening parameter at 296K (in cm-1/atm)
41- 45 F5.4 --- gamSelf [0.125] Self-broadening parameter at 296K
(in cm-1/atm)
46- 55 F10.4 cm-1 E" Lower state energy
56- 59 F4.2 --- nAir [1] Temperature dependence exponent (2)
60- 67 F8.6 --- delAir [0] Air pressure induced line shift at 296K
(in cm-1/atm)
68- 70 I3 --- V' [19,46] Upper vibrational state (3)
71- 73 I3 --- V" [14,44] Lower vibrational state (3)
74- 76 I3 --- J' [0,46] Upper J level rotational quantum number
77- 78 I2 --- K' [-1,23] Upper K level rotational quantum number
79- 80 I2 --- sig' [0,3] Upper σ level torsional quantum number
81- 82 I2 --- l' [-1/1] Upper l level vibrational angular momentum
quantum number
83- 85 I3 --- J" [0/45] Lower J level rotational quantum number
86- 87 I2 --- K" [0/22] Lower K level rotational quantum number
88- 89 I2 --- sig" [0/3] Lower σ level torsional quantum number
90- 91 I2 --- l" [0] Lower l level vibrational angular momentum
quantum number
92 I1 --- Ierr1 [2,4] Uncertainty index for line position (4)
93 I1 --- Ierr2 [3,5] Uncertainty index for integrated
absorption cross section (4)
94 I1 --- Ierr3 [1] Uncertainty index for the air-broadening
parameter (4)
95- 96 I2 --- Iref1 [0] First reference index (4)(5)
97- 98 I2 --- Iref2 [0] Second reference index (4)(5)
99-100 I2 --- Iref3 [0] Third reference index (4)(5)
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Note (1): In units of cm-1.(cm2/molecule).
Note (2): Of the air-broadening parameter.
Note (3): With 14 = ground state, 17 = 41, 19 = 91, 38 = 4191,
44 = 42, 45 = 4291, 46 = 43 (ni represents the vibrational
state vn = i).
Note (4): See details in Rothman, et al. (2005, J. Quant. Spectrosc. Radiat.
Transfer, 96, 139).
Note (5): Not used in this work.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 20-May-2009