J/ApJ/735/111 NH3 line lists at high temperatures (Hargreaves+, 2011)
Hot NH3 spectra for astrophysical applications.
Hargreaves R.J., Li G., Bernath P.F.
<Astrophys. J., 735, 111 (2011)>
=2011ApJ...735..111H 2011ApJ...735..111H
ADC_Keywords: Atomic physics ; Line Profiles ; Spectra, infrared
Keywords: brown dwarfs - infrared: general - methods: laboratory -
molecular data - stars: atmospheres - stars: low-mass
Abstract:
We present line lists for ammonia (NH3) at high temperatures
obtained by recording Fourier transform infrared emission spectra.
Calibrated line lists are presented for 12 temperatures
(300°C-1300°C in 100°C intervals and 1370°C) and each
line list covers the 740-2100cm-1 range, which includes the majority
of the ν2 umbrella bending mode region (11um) and the ν4
asymmetric bending mode region (6.2um). We also demonstrate the useful
technique of obtaining empirical lower state energies from a set of
spectra recorded at different sample temperatures. Using our NH3
spectra, we have estimated lower state energies (ELow in cm-1) and
our values have been incorporated into the line lists along with
calibrated wavenumbers (∼ν in cm-1) and calibrated line
intensities (S' in cm/molecule) for each line. We expect our hot
NH3 line lists to find direct application in the modeling of
planetary atmospheres and brown dwarfs.
Description:
We provide high-temperature line lists for NH3 using a similar
approach to that of Nassar & Bernath (2003JQSRT..82..279N 2003JQSRT..82..279N). Each line
list has been wavenumber and intensity calibrated using the HITRAN
2008 database (http://www.cfa.harvard.edu/hitran/).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 50 217686 Line lists
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See also:
VI/133 : A variationally computed hot NH3 line list - BYTe (Yurchenko+, 2011)
J/ApJ/724/994 : Cyano- to methanol and ammonia observations (Braakman+, 2010)
J/ApJ/714/476 : Complete spectrum of ethyl cyanide (Fortman+, 2010)
J/A+A/449/855 : Linelists for ammonia NH3, NH2D, ND2H, and ND3 (Coudert+, 2006)
Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 4 I4 degC Temp [300/1370] Temperature; in degree Celcius (1)
6- 17 F12.7 cm-1 sigma [745/2097] Wavenumber σ
19- 32 E14.8 cm Int [4.e-27/3.e-19] Line Intensity (cm/molecule)
34- 47 E14.8 cm-1 Elow [0/29267] Empirical Lower State Energy
49- 50 A2 --- q_Elow [0-3,1H] Quality identifier (2)
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Note (1): It is important to note that the line lists are temperature specific
and should only be used at the appropriate temperature. If the
intensities need to be scaled, then the closest temperature line
list should be chosen and the empirical lower state energies can be
used to adjust the lines intensities as needed (using Equation 3)
to reach additional temperatures.
Note (2): Quality code as follows:
1 = For lines occurring in 10-12 spectra the Elow was calculated from
the points below 1000C; these are considered to have the least error.
2 = For lines in which an Elow can still be determined from points below
1000C (i.e. occur in at least 3 spectra below 1000C) but occur in less
than 10 spectra overall.
3 = For any line in which an Elow is still able to be determined but only
from 3 points including spectra above 1000C; these are considered to
have the greatest error.
0 = Any line where Elow cannot be accurately determined (i.e. less than 3
points).
1H = The HITRAN lines are taken from Rothman et al. (2009JQSRT.110..533R 2009JQSRT.110..533R).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Dec-2012