J/A+A/435/373 Broadening of Fe II lines by H collisions (Barklem+, 2005)
The broadening of Fe II lines by neutral hydrogen collisions.
Barklem P.S., Aspelund-Johansson J.
<Astron. Astrophys. 435, 373 (2005)>
=2005A&A...435..373B 2005A&A...435..373B
ADC_Keywords: Atomic physics
Keywords: atomic data - line: profiles
Abstract:
Data for the broadening of 24188 Fe II lines by collisions with
neutral hydrogen atoms have been computed using the theory of Anstee &
O'Mara (1991MNRAS.253..549A 1991MNRAS.253..549A, 1995MNRAS.276..859A 1995MNRAS.276..859A) as extended to
singly ionised species and higher orbital angular momentum states by
Barklem & O'Mara (1998MNRAS.300..863B 1998MNRAS.300..863B). Data have been computed for
all Fe II lines between observed energy levels in the line lists of
Kurucz with loggf>-5 for which the theory is applicable. The variable
energy debt parameter Ep used in computing the second order
perturbation theory potential is chosen to be consistent with the long
range dispersion interaction constant C6 computed using the f-values
from Kurucz.
Description:
The file table1.dat lists the computed interaction constants along
with relevant input data for all levels of Fe II considered.
The file table2.dat lists the line broadening data along with
sufficient information to uniquely identify each line.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 78 572 Interaction parameters and input energy level data
table2.dat 98 24188 Line broadening data
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See also:
J/A+AS/142/467 : Broadening of metallic lines by H collisions (Barklem+ 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.3 cm-1 E Energy in waves/cm
17 A1 --- Par [eo] Parity, even or odd
21- 24 F4.1 --- J Total angular momentum quantum number J
27 I1 --- n Optical electron principal quantum number n
30 I1 --- l Optical electron orbital l quantum number
33- 42 F10.3 cm-1 Elim Adopted series limit energy
47- 51 F5.2 28Mbarn p2 Optical electron mean square position in
atomic units (a02 = 2.8x10-21m2)
54- 60 F7.2 --- C6 Dispersion coefficient
in atomic units (9.55x10-80J.m6)
62- 69 F8.1 --- Pol Static dipole polarizability
in atomic units (a03 = 1.48x10-31m3)
73- 78 F6.3 2Ry Ep Energy denominator Ep in atomic units
(Hartree energy = 4.36x10-18J)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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4- 8 F5.2 --- Ion [26.01] Packed element and ionisation
stage (1)
11- 20 F10.3 0.1nm lambda Air wavelength (Angstroms)
22- 25 F4.1 --- Jlow Lower level J quantum number
27- 30 F4.1 --- Jupp Upper level J quantum number
32- 42 F11.3 cm-1 Elow Lower level energy
44- 54 F11.3 cm-1 Eupp Upper level energy
58- 62 F5.0 28Mbarn Sigma Broadening cross-section in atomic units for
collision speed 10000m/s (2.80x10-21m2)
66- 70 F5.3 --- alpha Velocity parameter alpha
77- 82 F6.3 [rad.cm3/s] logGam Log of the FWHM per perturber at 10000K
86- 90 F5.0 28Mbarn Sigma49 Broadening cross-section in atomic units
(2.80x10-21m2) for collision speed
10000m/s in the approximation Ep=-4/9 in
atomic units
94- 98 F5.3 --- alpha49 Velocity parameter alpha in the
approximation Ep=-4/9 atomic units
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Note (1): The element and ionisation stage are packed into one parameter
given by Z + (Z-N)*0.01 where Z is the atomic number of the element,
and N is the total number of electrons.
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Acknowledgements: Paul Barklem, barklem(at)astro.uu.se
(End) Paul Barklem [Uppsala Univ., Sweden], Patricia Vannier [CDS] 04-Feb-2005