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EXPERIMENTAL INVESTIGATIONS OF ION CHARGE DISTRIBUTIONS, EFFECTIVE ELECTRON DENSITIES, AND ELECTRON-ION CLOUD OVERLAP IN ELECTRON BEAM ION TRAP PLASMA USING EXTREME-ULTRAVIOLET SPECTROSCOPY
Liang, G. Y.1,2,5; Lopez-Urrutia, J. R. Crespo1; Baumann, T. M.1; Epp, S. W.1; Gonchar, A.1; Lapierre, A.3; Mokler, P. H.1; Simon, M. C.1; Tawara, H.1; Maeckel, V.1; Yao, K.4; Zhao, G.2; Zou, Y.4; Ullrich, J.1
2009-09-10
Source PublicationASTROPHYSICAL JOURNAL
Volume702Issue:2Pages:838-850
AbstractSpectra in the extreme ultraviolet range from 107 to 353 angstrom emitted from Fe ions in various ionization stages have been observed at the Heidelberg electron beam ion trap (EBIT) with a flat-field grating spectrometer. A series of transition lines and their intensities have been analyzed and compared with collisional-radiative simulations. The present collisional-radiative model reproduces well the relative line intensities and facilitates line identification of ions produced in the EBIT. The polarization effect on the line intensities resulting from nonthermal unidirectional electron impact was explored and found to be significant (up to 24%) for a few transition lines. Based upon the observed line intensities, relative charge state distributions (CSD) of ions were determined, which peaked at Fe(23+) tailing toward lower charge states. Another simulation on ion charge distributions including the ionization and electron capture processes generated CSDs which are in general agreement with the measurements. By observing intensity ratios of specific lines from levels collisionally populated directly from the ground state and those starting from the metastable levels of Fe XXI, Fe X and other ionic states, the effective electron densities were extracted and found to depend on the ionic charge. Furthermore, it was found that the overlap of the ion cloud with the electron beam estimated from the effective electron densities strongly depends on the charge state of the ion considered, i.e. under the same EBIT conditions, higher charge ions show less expansion in the radial direction.
KeywordLine: Identification Methods: Analytical Methods: Laboratory
DOI10.1088/0004-637X/702/2/838
Indexed BySCI
Language英语
WOS IDWOS:000269245000003
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8375
Collection光学天文研究部
Affiliation1.Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
2.CAS, Natl Astron Observ, Beijing 100012, Peoples R China
3.TRIUMF, Canadian Natl Lab Particle & Nucl Phys, Vancouver, BC V6T 2A3, Canada
4.Fudan Univ, Inst Modern Phys, EBIT Lab, Shanghai 200433, Peoples R China
5.Univ Strathclyde, Dept Phys, Glasgow G4 0NG, Lanark, Scotland
Recommended Citation
GB/T 7714
Liang, G. Y.,Lopez-Urrutia, J. R. Crespo,Baumann, T. M.,et al. EXPERIMENTAL INVESTIGATIONS OF ION CHARGE DISTRIBUTIONS, EFFECTIVE ELECTRON DENSITIES, AND ELECTRON-ION CLOUD OVERLAP IN ELECTRON BEAM ION TRAP PLASMA USING EXTREME-ULTRAVIOLET SPECTROSCOPY[J]. ASTROPHYSICAL JOURNAL,2009,702(2):838-850.
APA Liang, G. Y..,Lopez-Urrutia, J. R. Crespo.,Baumann, T. M..,Epp, S. W..,Gonchar, A..,...&Ullrich, J..(2009).EXPERIMENTAL INVESTIGATIONS OF ION CHARGE DISTRIBUTIONS, EFFECTIVE ELECTRON DENSITIES, AND ELECTRON-ION CLOUD OVERLAP IN ELECTRON BEAM ION TRAP PLASMA USING EXTREME-ULTRAVIOLET SPECTROSCOPY.ASTROPHYSICAL JOURNAL,702(2),838-850.
MLA Liang, G. Y.,et al."EXPERIMENTAL INVESTIGATIONS OF ION CHARGE DISTRIBUTIONS, EFFECTIVE ELECTRON DENSITIES, AND ELECTRON-ION CLOUD OVERLAP IN ELECTRON BEAM ION TRAP PLASMA USING EXTREME-ULTRAVIOLET SPECTROSCOPY".ASTROPHYSICAL JOURNAL 702.2(2009):838-850.
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