J/A+A/543/A159 Line profiles of neutral Na perturbed by H2 (Allard+, 2012)
Theoretical and laboratory spectra of sodium perturbed by molecular hydrogen.
Allard N.F., Kielkopf J.F., Spiegelman F., Tinetti G., Beaulieu J.P.
<Astron. Astrophys. 543, A159 (2012)>
=2012A&A...543A.159A 2012A&A...543A.159A
ADC_Keywords: Atomic physics
Keywords: atomic data - line: profiles - brown dwarfs -
planets and satellites: atmospheres
Abstract:
We present new unified theory line profiles of neutral Na perturbed by
H2 . We used a priori NaH2 potentials, transition dipole moments
and validated pseudo-potentials as input to the line shape, and
evaluated the profiles for temperatures and densities appropriate for
modeling exoplanet and brown dwarf atmospheres. The theory for the
resonance lines was compared with new laboratory spectra of sodium to
test the validity of the potentials and resulting profiles. The
Lorentzian function commonly used to approximate a collisional line
profile in radiative transfer calculations is shown to be inadequate,
except within a few halfwidths of the line center. In the far wing,
the opacity caused by collisions may be several orders of magnitude
greater than the extrapolation of the Lorentzian core.
Description:
The tables contain theoretical spectra of sodium perturbed by
molecular hydrogen. Data from Fig. 5 are in table5.dat giving the
absorption coefficient of 3s-3p in arbitrary units from 5001 Angstroms
to 9459 Angstroms at 1500K and a molecular hydrogen density of
1019cm-3. Data from Fig. 6 are in table6.dat giving the absorption
coefficient of 3p-4s in cm2 from 1.10 microns to 1.15 microns at
1000K and a molecular hydrogen density of 1019cm-3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 15 4459 Profile of the Na 3s-3p transition broadened by
molecular hydrogen (Fig. 5 of the paper)
table6.dat 27 183 Profile of the Na 3s-3p transition broadened by
molecular hydrogen (Fig. 6 of the paper)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 I4 0.1nm lambda Wavelength
5- 15 E11.5 --- Int Absorption coefficient in arbitrary units (1)
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Note (1): Normalize the frequency-integrated absorption coefficient to unity
and scale as described in the paper.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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6- 13 F8.6 um lambda Wavelength
17- 27 E11.6 cm+2 sigma Absorption cross-section (1)
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Note (1): Multiply the absorption cross section by the absorber density in
atoms/cm3 to obtain the absorption coefficient in cm-1.
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Acknowledgements:
Nicole Allard, nicole.allard(at)obspm.fr
(End) Patricia Vannier [CDS] 20-Jul-2012