Laboratory Measurements of 3 → 2 X‐Ray Line Ratios of F‐like Fexviiiand Nixx | Zendy

M. F. Gu | Zendy; H. Chen | Zendy; G. V. Brown | Zendy; P. Beiersdörfer | Zendy; S. M. Kahn | Zendy

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Laboratory Measurements of 3 → 2 X‐Ray Line Ratios of F‐like Fexviiiand Nixx

Author(s) -

M. F. Gu,

H. Chen,

G. V. Brown,

P. Beiersdörfer,

S. M. Kahn

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/522078

Subject(s) - electron beam ion trap , physics , atomic physics , spectrometer , excitation , line (geometry) , resonance (particle physics) , beam (structure) , coupling (piping) , cathode ray , electron , nuclear physics , optics , mechanical engineering , geometry , mathematics , quantum mechanics , engineering

The intensity ratios of 3 {yields} 2 emission lines of Fe XVIII and Ni XX were measured on the Livermore electron beam ion trap (EBIT-I) with a flat-field grating spectrometer. The results were compared with distorted-wave (DW) calculations obtained with the Flexible Atomic Code and recent close-coupling calculations using the R-matrix code. The measured 3s {yields} 2p/3d {yields} 2p ratios are about 20-40% higher than the theoretical values. When more extended configuration interaction is included in the DW theory, the agreement with the measurements improved slightly. At the beam energies of these measurements, no significant resonance contribution is expected to be present, and the discrepancies represent the uncertainties in the direct excitation cross sections.

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