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J/ApJS/123/295 Electron impact excitation in Fe XI (Gupta+, 1999)
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Electron Impact Excitation of Fine-Structure Levels in Sulfur-like Fe XI
Gupta G.P., Tayal S.S.
<Astrophys. J. Suppl. Ser. 123, 295 (1999)>
=1999ApJS..123..295G (SIMBAD/NED BibCode)
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ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes
Abstract:
Collision strengths for electron impact excitation of fine-structure
levels in sulfur-like Fe XI are calculated in a semirelativistic
R-matrix approach. The 38 fine-structure levels arising from the 20 LS
states 3s^2^3p^4^ ^3^P, ^1^D, ^1^S; 3s3p^5^ ^3^P^0^, ^1^P^0^;
3s^2^3p^3^(^4^S^0^)3d ^3^D^0^, 3s^2^3p^3^(^2^P^0^)3d ^1,3^P^0^,
^1,3^D^0^, ^1,3^F^0^, 3s^2^3p^3^(^2^D^0^)3d ^1,3^S^0^, ^1,3^P^0^,
^1,3^D^0^, ^1,3^F^0^ are included in our calculation. The target
levels are represented by configuration interaction wave functions.
The relativistic effects are considered in the Breit-Pauli
approximation by including one-body mass correction, Darwin term, and
spin-orbit terms in the scattering equations. Collision strengths for
transitions from the 3s^2^3p^4^ ^3^P_2,1,0_ levels to the
fine-structure levels of the 3s^2^3p^3^3d configuration are compared
with the distorted-wave results of Bhatia & Doschek (1996) at 8.0,
16.0, 24.0 ryd. There are some significant discrepancies between the
two calculations, mostly caused by the difference in target wave
functions. The collision strengths are integrated over a Maxwellian
distribution of electron energies to obtain effective collision
strengths over the temperature range from 5x10^5^ to 5x10^6^ K.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 38 Comparison of calculated and experimental
energy levels of Fe XI
table2.dat 67 108 Collison strengths for electron excitation of
fine-structure levels in Fe XI
table3.dat 87 673 Effective Collision Strengths for Fe XI
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See also:
J/A+A/293/953 : IRON project VI. FeII collision strengths (Zhang+, 1995)
J/A+AS/119/523 : IRON project XVIII. Fe III data (Zhang 1996)
J/A+AS/126/373 : IRON Project XXVII. Fe IV collision strengths (Zhang+ 1997)
J/A+AS/136/395 : IRON Project XXXVII. Fe VI collision strengths (Chen+ 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index Index number of the level
7- 33 A27 --- Config Electron configuration
36 I1 --- J Total angular momentum of the level
38- 43 F6.4 2Ry ELevC Energy levels of the present calculation
in hartrees
45- 50 F6.4 2Ry ELevE ? Energy levels from experimental work
in hartrees
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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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1 I1 --- LInd Lower level index (see Index in table1.dat)
4- 5 I2 --- UInd Upper level index (see Index in table1.dat)
10- 16 E7.2 --- CS8P Collision Strength (at 8 Ryd) from this work
20- 26 E7.2 --- CS8BD Collision Strength (at 8 Ryd) from
Bhatia & Doschek 1996
30- 36 E7.2 --- CS16P Collision Strength (at 16 Ryd) from this work
40- 46 E7.2 --- CS16BD Collision Strength (at 16 Ryd) from
Bhatia & Doschek 1996
50- 56 E7.2 --- CS24P Collision Strength (at 24 Ryd) from this work
60- 66 E7.2 --- CS24BD Collision Strength (at 24 Ryd) from
Bhatia & Doschek 1996
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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 --- LInd Lower level index (see Index in table1.dat)
5- 6 I2 --- UInd Upper level index (see Index in table1.dat)
10- 16 E7.2 --- CS5 Effective Collision Strength at 5x10^5^ K
20- 26 E7.2 --- CS8 Effective Collision Strength at 5x10^5^ K
30- 36 E7.2 --- CS10 Effective Collision Strength at 10x10^5^ K
40- 46 E7.2 --- CS15 Effective Collision Strength at 15x10^5^ K
50- 56 E7.2 --- CS20 Effective Collision Strength at 20x10^5^ K
60- 66 E7.2 --- CS30 Effective Collision Strength at 30x10^5^ K
70- 76 E7.2 --- CS40 Effective Collision Strength at 40x10^5^ K
80- 86 E7.2 --- CS50 Effective Collision Strength at 50x10^5^ K
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History:
From ApJ electronic edition
References:
Bhatia, A. K., & Doschek, G. A. 1996, At. Data Nucl. Data Tables, 64, 183
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(End) Greg Schwarz (AAS) 14-Feb-2000