J/A+A/600/A85He-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 (SIMBAD/NED BibCode)ADC_Keywords: Atomic physicsKeywords: atomic data, atomic processesAbstract: 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:

FileName Lrecl Records Explanations

ReadMe 80 . This file table1.dat 152 26835 Effective collision strengths

See also: J/A+A/592/A135 : SiXIII and SXV collision strengths (Fernandez-Menchero+, 2016)Byte-by-byte Description of file: table1.dat

Bytes Format Units Label Explanations

1- 2 I2 --- Z Atomic number 5- 6 I2 --- i Lower level index 9- 17 A9 --- Leveli Lower level identification, n^{S}L_{J}≡ 1snl^{S}L_{J}20- 21 I2 --- j Upper level index 24- 32 A9 --- Levelj Upper level identification, n^{S}L_{J}≡ 1snl^{S}L_{J}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}*10^{3}K 64- 71 E8.2 --- ECS2k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*2*10^{3}K 73- 80 E8.2 --- ECS5k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*5*10^{3}K 82- 89 E8.2 --- ECS10k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*10^{4}K 91- 98 E8.2 --- ECS20k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*2*10^{4}K 100-107 E8.2 --- ECS50k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*5*10^{4}K 109-116 E8.2 --- ECS100k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*10^{5}K 118-125 E8.2 --- ECS200k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*2*10^{5}K 127-134 E8.2 --- ECS500k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*5*10^{5}K 136-143 E8.2 --- ECS1000k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*10^{6}K 145-152 E8.2 --- ECS2000k Effective collision strengths for transition i-j at electron temperature of (Z-1)^{2}*2*10^{6}K

Acknowledgements: Ran Si, rsi13(at)fudan.edu.cn(End)Patricia Vannier [CDS] 13-Jan-2017

The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line |

catalogue service

© Unistra/CNRS