J/A+A/600/A85 He-like ions (Z=20-42) effective collision strengths (Si+, 2017)
Electron impact excitation for He-like ions with Z = 20 - 42.
Si R., Li S., Wang K., Guo X.L., Chen Z.B., Yan J., Chen C.Y., Brage T.,
Zou Y.M.
<Astron. Astrophys. 600, A85 (2017)>
=2017A&A...600A..85S 2017A&A...600A..85S (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: atomic data, atomic processes
Abstract:
Spectral lines of He-like ions are among the most prominent features
in X-ray spectra from a large variety of astrophysical and
high-temperature fusion plasmas. A reliable plasma modeling and
interpretation of the spectra require a large amount of accurate
atomic data related to various physical processes. In this paper, we
focus on the electron-impact excitation (EIE) process.
We adopted the independent process and isolated resonances
approximation using distorted waves (IPIRDW). Resonant stabilizing
transitions and decays to lower-lying autoionizing levels from the
resonances are included as radiative damping. To verify the
applicability of the IPIRDW approximation, an independent Dirac
R-matrix calculation was also performed. The two sets of results show
excellent agreement.
We report electron impact excitation collision strengths for
transitions among the lowest 49 levels of the 1snl(n≤5,l≤(n-1))
configurations in He-like ions with 20≤Z≤42. The line ratios R and G
are calculated for Fe XXV and Kr XXXV.
Description:
Transition energy differences, transition rates and effective
collision strengths for transitions of He-like ions with Z = 20 - 42.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 152 26835 Effective collision strengths
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See also:
J/A+A/592/A135 : SiXIII and SXV collision strengths (Fernandez-Menchero+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Z Atomic number
5- 6 I2 --- i Lower level index
9- 17 A9 --- Leveli Lower level identification,
n SLJ ≡ 1snl SLJ
20- 21 I2 --- j Upper level index
24- 32 A9 --- Levelj Upper level identification,
n SLJ ≡ 1snl SLJ
35- 44 E10.4 eV DeltaE Transition energy difference
46- 53 E8.2 s-1 Aji ? Sum of E1, M1, E2, and M2 transition rates
for transition i-j
55- 62 E8.2 --- ECS1k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*103K
64- 71 E8.2 --- ECS2k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*2*103K
73- 80 E8.2 --- ECS5k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*5*103K
82- 89 E8.2 --- ECS10k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*104K
91- 98 E8.2 --- ECS20k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*2*104K
100-107 E8.2 --- ECS50k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*5*104K
109-116 E8.2 --- ECS100k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*105K
118-125 E8.2 --- ECS200k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*2*105K
127-134 E8.2 --- ECS500k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*5*105K
136-143 E8.2 --- ECS1000k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*106K
145-152 E8.2 --- ECS2000k Effective collision strengths for transition i-j
at electron temperature of (Z-1)2*2*106K
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Acknowledgements:
Ran Si, rsi13(at)fudan.edu.cn
(End) Patricia Vannier [CDS] 13-Jan-2017