Electron-ion Recombination Rate Coefficients of Be-like Ca-40(16+)

doi:10.3847/1538-4357/aacc69

	Electron-ion Recombination Rate Coefficients of Be-like Ca-40(16+)
	Wang, S. X.1,2; Xu, X.1,2; Huang, Z. K.3; Wen, W. Q.3; Wang, H. B.3; Khan, N.3; Preval, S. P.4; Badnell, N. R.5; Schippers, S.6; Mahmood, S.3,7
刊名	ASTROPHYSICAL JOURNAL
	2018-08-01
卷号	862 期号:2 页码:134
关键词	atomic data atomic processes plasmas
ISSN号	0004-637X
DOI	10.3847/1538-4357/aacc69
英文摘要	Electron-ion recombination rate coefficients for beryllium-like calcium ions in the center of mass energy from 0 to 51.88 eV have been measured by means of the electron-ion merged-beam technique at the main cooler storage ring at the Institute of Modern Physics in Lanzhou, China. The measurement energy range covers the dielectronic recombination (DR) resonances associated with the 2s(2) S-1(0) -> 2s2p P-3(0,1,2), P-1(1) core excitations and the trielectronic recombination (TR) resonances associated with the 2s(2) S-1(0) -> 2p(2) P-3(0,1,2), D-1(2), S-1(0) core excitations. In addition, the AUTOSTRUCTURE code was used to calculate the recombination rate coefficients for comparison with the experimental results. Resonant recombination originating from parent ions in the long-lived metastable state 2s2p P-3(0) ions has been identified in the recombination spectrum below 1.25 eV. A good agreement is achieved between the experimental recombination spectrum and the result of the AUTOSTRUCTURE calculations when fractions of 95% ground-state ions and 5% metastable ions are assumed in the calculation. It is found that the calculated TR resonance positions agree with the experimental peaks, while the resonance strengths are underestimated by the theoretical calculation. Temperature dependent plasma rate coefficients for DR and TR in the temperature range of 10(3) -10(8) K were derived from the measured electron-ion recombination rate coefficients and compared with the available theoretical results from the literature. In the temperature range of photoionized plasmas, the presently calculated rate coefficients and the recent results of Gu & Colgan et al. are up to 30% lower than the experimentally derived ones, and the older atomic data are even up to 50% lower than the present experimental result. This is because strong resonances situated below electron-ion collision energies of 50 meV were underestimated by the theoretical calculation, which also has a severe influence on the rate coefficients in low-temperature plasmas. In the temperature range of collisionally ionized plasmas, agreement within 25% was found between the experimental result and the present calculation as well as the calculation by Colgan et al. The present result constitutes a set of benchmark data for use in astrophysical modeling.
资助项目	National Key R&D Program of China[2017YFA0402300] ; National Natural Science Foundation of China[11320101003] ; National Natural Science Foundation of China[U1732133] ; National Natural Science Foundation of China[11611530684] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB21030300] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-SLH006] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; EPSRC[EP/L021803/1] ; CAS Presidents International Fellowship Initiative (PIFI)
WOS关键词	X-RAY ASTROPHYSICS ; DIELECTRONIC RECOMBINATION ; IONIZATION EQUILIBRIUM ; SOLAR-FLARE ; ATOMIC DATA ; XMM-NEWTON ; PLASMAS ; CA ; PHOTORECOMBINATION ; TEMPERATURE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000440547200010
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Program of Frontier Sciences, CAS ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; EPSRC ; CAS Presidents International Fellowship Initiative (PIFI)
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/59207]
专题	中国科学院近代物理研究所
作者单位	1.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China 2.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China 3.Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China 4.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China 5.Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England 6.Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland 7.Justus Liebig Univ Giessen, Phys Inst 1, Heinrich Buff Ring 16, D-35392 Giessen, Germany 8.PINSTECH, Phys Div, Islamabad 45650, Pakistan
推荐引用方式 GB/T 7714	Wang, S. X.,Xu, X.,Huang, Z. K.,et al. Electron-ion Recombination Rate Coefficients of Be-like Ca-40(16+)[J]. ASTROPHYSICAL JOURNAL,2018,862(2):134.
APA	Wang, S. X..,Xu, X..,Huang, Z. K..,Wen, W. Q..,Wang, H. B..,...&Zhu, L. F..(2018).Electron-ion Recombination Rate Coefficients of Be-like Ca-40(16+).ASTROPHYSICAL JOURNAL,862(2),134.
MLA	Wang, S. X.,et al."Electron-ion Recombination Rate Coefficients of Be-like Ca-40(16+)".ASTROPHYSICAL JOURNAL 862.2(2018):134.