J/A+A/422/731 Fe X Benchmarking atomic data (Del Zanna+, 2004)
Benchmarking atomic data for astrophysics: Fe X.
Del Zanna G., Berrington K.A., Mason H.E.
<Astron. Astrophys., 422, 731-749 (2004)>
=2004A&A...422..731D 2004A&A...422..731D
ADC_Keywords: Atomic physics
Keywords: atomic data - line: identification - Sun: corona -
techniques: spectroscopic
Abstract:
This is the first in a series of papers in which we benchmark recent
atomic data available for astrophysical applications. We review
various issues related to the completeness and accuracy of both
theoretical and experimental data. In this paper, the available
experimental and atomic data for Fe X (n=3 configurations) are
reviewed and assessed. New collisional and radiative data are
calculated to supplement published data. The radiative calculations
are done with empirical adjustements that take into account observed
wavelengths. Previous line identifications are also reviewed and
assessed. Our approach focuses on the brightest spectral lines, and
uses both wavelengths and line intensities to assess the line
identifications on a quantitative basis. Although many previous line
identifications are confirmed, some are rejected (e.g. the coronal
line observed at 1582.35Å). We confirm previously suggested
identifications (e.g. 257.262Å,1028.02Å), and we present new
ones, (e.g. the lines of the 3s2 3p4 3d-3s 3p5 3d transition
array). In addition, we highlight the presence of blends and we review
which spectral lines are best for density diagnostics or for
instrument calibration. The theoretical data (line intensities and
level lifetimes) are benchmarked against well-calibrated spectroscopic
observations of the solar corona and laboratory measurements. The
agreement between theoretical and experimental data which we achieve
with our new model ion is very good.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 115 465 Effective collision strengths
table3.dat 97 54 Fine Structure Energy table with spectroscopic
identifications
table4.dat 64 1250 Full set of wavelengths, oscillator strengths
(gf), and transition probabilities (A)
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See also:
http://www.nist.gov/ : NIST Home Page
J/A+A/430/331 : Fe XXIII Benchmarking atomic data (Chidichimo+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- i Index of the lower level (see table3.dat)
4- 5 I2 --- j Index of the upper level (see table3.dat)
7- 15 E9.3 --- gf Weighted oscillator strengths (1)
17- 25 E9.3 cm-1 DE Energy difference between the two levels
27- 35 E9.3 --- EFS2.512 Effective collision strength at T=2.512e+05K (2)
37- 45 E9.3 --- EFS3.981 Effective collision strength at T=3.981e+05K (2)
47- 55 E9.3 --- EFS6.310 Effective collision strength at T=6.310e+05K (2)
57- 65 E9.3 --- EFS10.00 Effective collision strength at T=1.000e+06K (2)
67- 75 E9.3 --- EFS15.85 Effective collision strength at T=1.585e+06K (2)
77- 85 E9.3 --- EFS25.12 Effective collision strength at T=2.512e+06K (2)
87- 95 E9.3 --- EFS39.81 Effective collision strength at T=3.981e+06K (2)
97-105 E9.3 --- EFS63.10 Effective collision strength at T=6.310e+06K (2)
107-115 E9.3 --- EFS100.0 Effective collision strength at T=1.000e+07K (2)
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Note (1): The weighted oscillator strengths and energy differences values
listed are those originating from the scattering calculation.
Note (2): The EFS (upsilon) values are Maxwellian-averaged collision
strengths calculated in the Breit-Pauli R-matrix approach, including
180 target levels arising from the lowest 5 configurations.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index Energy level index
4- 50 A47 --- Conf Configuration and percentage mixing
52 I1 --- 2S+1 Spin 2S+1
54 A1 --- L Angular momentum L
56 A1 --- P Parity (odd/even)
58- 60 A3 --- J Total angular momentum J
62- 69 F8.1 cm-1 E Energy (best estimate)
73- 75 I3 cm-1 e_E Uncertainty on E
77- 83 F7.1 --- E-Enist ? Energy difference.
Enist: energy as in the NIST database
85- 91 I7 --- E-Ecc Energy difference.
Ecc: energy from the scattering calculation
93- 96 I4 --- E-Ess Energy difference.
Ess: energy from SUPERSTRUCTURE, with term
energy corrections
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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- 2 I2 --- i index of the lower level (see Table3.dat)
4- 5 I2 --- j index of the upper level (see Table3.dat)
7- 18 F12.3 0.1nm lambda Wavelength calculated from the best energy E
20- 31 F12.3 0.1nm e_lambda Estimated uncertainty on the wavelength
34- 42 E9.3 --- gf Weighted oscillator strengths
45- 53 E9.3 s-1 A Transition probability
55- 65 A11 --- Type Type of transition (1)
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Note (1): Type of transitions are noted as follows:
E1 = electric dipole
M1 = magnetic dipole
E2 = electric quadrupole
M2 = magnetic quadrupole
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Acknowledgements: Giulio Del Zanna, G.Del-Zanna(at)damtp.cam.ac.uk
(End) Patricia Vannier [CDS] 14-Jan-2005