J/ApJS/166/634 OIV Effective collision strength (Tayal+, 2006)
Breit-Pauli r-matrix calculation for electron collision rates in OIV.
Tayal S.S.
<Astrophys. J. Suppl. Ser., 166, 634-649 (2006)>
=2006ApJS..166..634T 2006ApJS..166..634T
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic process
Abstract:
Electron collision excitation strengths and rates for infrared and
ultraviolet lines arising from transitions between the fine-structure
levels of the 2s22p, 2s2p2, 2p3, 2s23s, 2s23p, 2s23d,
2s2p3s, 2s2p3p, 2s2p3d, 2s24s, and 2s24p configurations of OIV
have been calculated using Breit-Pauli R-matrix approach.
Configuration-interaction wave functions have been used for an
accurate representation of target levels. These wave functions give
excitation energies that are in close agreement with experiment.
Oscillator strengths and transition probabilities for UV and EUV lines
compare very well with previous calculations. The Rydberg series of
resonances converging to the excited levels are explicitly included in
the scattering calculation and are found to make substantial
contribution to collision strengths. The effective collision strengths
are obtained by integrating total collision strengths over a
Maxwellian distribution of electron energies, and these are presented
over a wide temperature range suitable for modeling of astrophysical
plasmas. Significant qualitative and quantitative differences with
earlier results of effective collision strengths are noted.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 54 Calculated and experimental excitation energies
of O IV energy levels
table2.dat 103 121 Oscillator strengths and transition
probabilities in O IV
table4.dat 81 460 Effective Collision Strengths for transitions
in O IV
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See also:
J/A+AS/109/551 : Stark broadening. XII. OIV + OV (Dimitrijevic+, 1995)
J/ApJ/526/544 : Collision strengths in S III (Tayal+, 1999)
J/ApJS/123/295 : Electron impact excitation in Fe XI (Gupta+, 1999)
J/A+A/418/363 : Effective collision strengths for Cl II (Tayal+, 2004)
J/A+A/426/717 : Oscillator strengths for ClII lines (Tayal+, 2004)
J/ApJS/163/207 : Oscillator and collision strengths in NI (Tayal+, 2006)
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
4- 27 A24 --- Term Term designation
29- 31 A3 --- J J value
37- 43 F7.5 Ry Epre Energy, present results
45- 51 F7.5 Ry Eexp Energy, experimental
53- 60 F8.5 Ry Ediff Difference of energies
62- 68 F7.5 Ry Eother ? Energy from Correge & Hibbert
(2002, J. Phys. B, 35, 1211)
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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- 45 A45 --- Trans Transition
47- 49 A3 --- J The J transition
51- 53 A3 --- J' The J' transition
55- 61 F7.2 0.1nm Wave Wavelength in units of Angstroms
63- 69 E7.2 --- fL The present fL value
71- 77 E7.2 --- fV The present fV value
79- 86 E8.2 s-1 Aki The present Aki value
88- 94 E7.2 --- fikW ? Wiese et al. (1996, Phys. Chem. Ref. Data
Monograph 7) fik value
96-103 E8.2 s-1 AkiW ? Wiese et al. (1996, Phys. Chem. Ref. Data
Monograph 7) Aki value
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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 i lower level index of the transition
3 A1 --- --- [-]
4- 5 I2 --- j j upper level index of the transition
7- 15 F9.2 0.1nm Wave ? Wavelength in units of Angstroms
17- 21 F5.3 --- ECS3E+3 Effective collision strength at Te= 3000K
23- 27 F5.3 --- ECS5E+3 Effective collision strength at Te= 5000K
29- 33 F5.3 --- ECS7E+3 Effective collision strength at Te= 7000K
35- 39 F5.3 --- ECS1E+4 Effective collision strength at Te= 10000K
41- 45 F5.3 --- ECS2E+4 Effective collision strength at Te= 20000K
47- 51 F5.3 --- ECS3E+4 Effective collision strength at Te= 40000K
53- 57 F5.3 --- ECS6E+4 Effective collision strength at Te= 60000K
59- 63 F5.3 --- ECS8E+4 Effective collision strength at Te= 80000K
65- 69 F5.3 --- ECS1E+5 Effective collision strength at Te=100000K
71- 75 F5.3 --- ECS2E+5 Effective collision strength at Te=200000K
77- 81 F5.3 --- ECS4E+5 Effective collision strength at Te=400000K
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 29-May-2008