J/A+A/548/A27 Oscillator and collision strengths for MgVI (Tayal+, 2012)
Oscillator strengths and electron excitation strengths for electron excitation
of Mg VI.
Tayal S.S.
<Astron. Astrophys. 548, A27 (2012)>
=2012A&A...548A..27T 2012A&A...548A..27T
ADC_Keywords: Atomic physics
Keywords: atomic data - atomic processes - line formation
Abstract:
Electron impact excitation collision strengths and oscillator
strengths for the astrophysically important lines in MgVI are
reported. Thermally averaged collision strengths are presented as a
function of electron temperature for application to solar and other
astrophysical plasmas.
Description:
Excitation energies (in Ryd) of the 74 target Levels included in the
present transition rates and scattering calculations. Present results
are compared with observed values from NIST compilation
(http://physics.nist.gov) and the CI calculation of Bhatia & Landi,
(2003, At. Data and Nucl. Data Tables, 85, 317) (BL). The lifetimes in
dipole approximation are also given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 74 Excitation energies (in Ry) of the 74 target levels
included in the present transition rates and
scattering calculations
table2.dat 109 69 Comparison of oscillator strengths and transition
probabilities for some dipole radiative E1
transitions
table3.dat 106 718 Oscillator strengths and transition probabilities
for dipole radiative E1 transitions
table4.dat 118 2701 Effective collision strengths for transitions in MgVI
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See also:
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/A+A/486/629 : Effective collision strengths for C II (Tayal, 2008)
J/ApJS/163/207 : Oscillator and collision strengths in NI (Tayal+, 2006)
J/ApJS/166/634 : OIV Effective collision strength (Tayal+, 2006)
J/A+A/510/A79 : Effective collision strengths for K II (Tayal+, 2010)
J/ApJS/188/32 : Breit-Pauli transition probabilities for SII (Tayal+, 2010)
J/A+A/541/A61 : Oscillator and collision strengths for SiVIII (Tayal+, 2012)
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 [1,74] Index
4- 31 A28 --- State State
33 I1 --- 2J J value for the level of the state
35- 42 F8.5 Ry E Present excitation energy
44- 51 F8.5 Ry Eexp ? Excitation energy from experiment (1)
53- 60 F8.5 Ry E.LB ? Excitation energy from CI calculation of
Landi & Bhatia (2007, At. Data and Nucl.
Data Tables, 93, 1)
62- 70 F9.6 Ry E.FT ? Excitation energy from CI calculation of
Froese Fischer & Tachiev (2004, At. Data
and Nucl. Data Tables, 87, 1)
72- 79 E8.3 ns tau ? Lifetime τ in dipole approximation from
the present calculation
81- 88 E8.3 ns tau.FT ? Lifetime τ in dipole approximation from
Froese Fischer & Tachiev (2004, At. Data
and Nucl. Data Tables, 87, 1)
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Note (1): From NIST compilation (http://physics.nist.gov)
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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- 18 A18 --- i Initial level of a transition
20 A1 ---- --- [-]
22- 45 A24 --- f Final level of a transition
47 I1 ---- gi (2J+1) value for initial level of a transition
49 I1 ---- gf (2J+1) value for final level of a transition
51- 59 E9.4 --- fif Present length value of oscillator strength
61- 69 E9.4 s-1 Aif Present length value of transition probability
71- 79 E9.4 --- fifBL ? Length value of oscillator strength from
calculations of Landi & Bhatia (2007, At.
Data and Nucl. Data Tables, 93, 1)
81- 89 E9.4 s-1 AifBL ? Length value of transition probability from
calculations of Landi & Bhatia, (2007, At.
Data and Nucl. Data Tables, 93, 1)
91- 99 E9.4 --- fifFT Length value of oscillator strength from
calculations of Froese Fischer & Tachiev
(2004, At. Data and Nucl. Data Tables, 87, 1)
101-109 E9.4 s-1 AifFT Length value of transition probability from
calculations of Froese Fischer & Tachiev
(2004, At. Data and Nucl. Data Tables, 87, 1)
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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- 27 A27 --- i Initial level of a transition
29 A1 ---- --- [-]
32- 58 A27 --- f Final level of a transition
61 I1 --- gi (2J+1) value for the lower level of the transition
63- 64 I2 --- gf (2J+1) value for the upper level of the transition
66- 76 F11.3 0.1nm lambda Wavelength of the transition (Angstroem)
78- 86 E9.5 --- fL Present length value of oscillator strength
88- 96 E9.5 --- fV Present velocity value of oscillator strength
98-106 E9.5 s-1 Aif Present length value of transition probability
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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 [1,73] i lower level index of the transition
4 A1 ---- --- [-]
6- 7 I2 --- j [2,74] j upper level index of the transition
11- 18 E8.3 --- ECS10k Effective collision strength at Te=10000K
21- 28 E8.3 --- ECS20k Effective collision strength at Te=20000K
31- 38 E8.3 --- ECS30k Effective collision strength at Te=30000K
41- 48 E8.3 --- ECS50k Effective collision strength at Te=50000K
51- 58 E8.3 --- ECS75k Effective collision strength at Te=75000K
61- 68 E8.3 --- ECS100k Effective collision strength at Te=100000K
71- 78 E8.3 --- ECS250k Effective collision strength at Te=250000K
81- 88 E8.3 --- ECS500k Effective collision strength at Te=500000K
91- 98 E8.3 --- ECS750k Effective collision strength at Te=750000k
101-108 E8.3 --- ECS1M Effective collision strength at Te=1MK
111-118 E8.3 --- ECS2M Effective collision strength at Te=2MK
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Acknowledgements:
Swaraj Tayal, stayal (at)cau.edu
(End) Patricia Vannier [CDS] 09-Oct-2012