J/A+A/493/697 Effective collision strength of Mg IX (Hudson, 2009)
Breit-Pauli R-matrix calculation of fine-structure effective collision strengths
for the electron impact excitation of Mg IX.
Hudson C.E.
<Astron. Astrophys. 493, 697 (2009)>
=2009A&A...493..697H 2009A&A...493..697H (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic processes - line: formation - methods: analytical
Abstract:
Electron impact excitation collision strengths are required for
analysing and interpreting stellar observations.
This calculation aims to provide fine-structure effective collision
strengths for the Mg IX ion using a method that includes
contributions from resonances.
A 26-state Breit-Pauli R-matrix calculation has been performed.
Description:
The effective collision strengths are presented in this table for all
transitions among the lowest 46 fine-structure levels belonging to the
2s2, 2s2p, 2p2, 2s3s, 2s3p, 2s3d, 2p3s, 2p3p and 2p3p
configurations of MgIX.
These have been calculated using the Breit-Pauli R-matrix method. Each
fine-structure level is assigned an index number in Table 4 of the
manuscript ranging from 1 to 46. These index values are used here in
Table 6 to refer to particular transitions, eg. Index 2-5 denotes the
transition 2s2p 3Po(J=0) -- 2s2p 1Po(J=1).
The effective collision strengths for each transition are presented in
rows for a number of electron temperatures ranging from log10(T)=3.0
to log10(T)=7.0 in steps of 0.2dex.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 30 46 J-levels
table6.dat 197 1035 Effective collision strengths for MgIX
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See also:
J/A+A/430/725 : N II effective collision strengths (Hudson+, 2005)
J/A+A/432/731 : Effective collision strengths for C II (Wilson+, 2005)
J/A+A/436/1131 : Effective collision strengths for Al III (Hudson+ 2005)
J/A+A/452/1113 : S V effective collision strengths (Hudson+, 2006)
J/A+A/494/729 : Effective collision strength of Mg V (Hudson+, 2009)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Index Index number
7- 14 A8 --- LS LS state
19 I1 --- J J-value
24- 30 F7.4 Ry E Energy of fine-structure level in Rydbergs
(as determined by the present work)
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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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3- 4 I2 --- i1 Index number of lower transition state
7- 8 I2 --- i2 Index number of upper transition state
10- 17 E8.3 --- ECS3.0 Effective collision at log(T)=3.00
19- 26 E8.3 --- ECS3.2 Effective collision at log(T)=3.20
28- 35 E8.3 --- ECS3.4 Effective collision at log(T)=3.40
37- 44 E8.3 --- ECS3.6 Effective collision at log(T)=3.60
46- 53 E8.3 --- ECS3.8 Effective collision at log(T)=3.80
55- 62 E8.3 --- ECS4.0 Effective collision at log(T)=4.00
64- 71 E8.3 --- ECS4.2 Effective collision at log(T)=4.20
73- 80 E8.3 --- ECS4.4 Effective collision at log(T)=4.40
82- 89 E8.3 --- ECS4.6 Effective collision at log(T)=4.60
91- 98 E8.3 --- ECS4.8 Effective collision at log(T)=4.80
100-107 E8.3 --- ECS5.0 Effective collision at log(T)=5.00
109-116 E8.3 --- ECS5.2 Effective collision at log(T)=5.20
118-125 E8.3 --- ECS5.4 Effective collision at log(T)=5.40
127-134 E8.3 --- ECS5.6 Effective collision at log(T)=5.60
136-143 E8.3 --- ECS5.8 Effective collision at log(T)=5.80
145-152 E8.3 --- ECS6.0 Effective collision at log(T)=6.00
154-161 E8.3 --- ECS6.2 Effective collision at log(T)=6.20
163-170 E8.3 --- ECS6.4 Effective collision at log(T)=6.40
172-179 E8.3 --- ECS6.6 Effective collision at log(T)=6.60
181-188 E8.3 --- ECS6.8 Effective collision at log(T)=6.80
190-197 E8.3 --- ECS7.0 Effective collision at log(T)=7.00
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Acknowledgements:
Claire Hudson, c.hudson(at)am.qub.ac.uk
(End) Claire Hudson [Queens Univ. Belfast], Patricia Vannier [CDS] 19-Jan-2009