Measurement of level-specific dielectronic-recombination cross sections of heliumlike Fe XXV

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.46.3812· OSTI ID:6947915

Beiersdorfer, P; Phillips, T W; Wong, K L; Marrs, R E; Vogel, D A ^[1]

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1. High Temperature Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

The strengths of individual 1{ital s}2{ital l}2{ital l}{prime} resonances for dielectronic recombination of heliumlike iron are measured on an electron-beam ion trap using high-resolution x-ray spectroscopy. An energy resolution {Delta}{ital E}/{ital E} of better than 0.1% is achieved by monitoring the exit channel of the recombination process. Dielectronic-resonance strengths are measured relative to the cross section for nonresonant radiative electron capture of heliumlike Fe XXV, and an overall uncertainty of 20% is achieved. Good agreement with theory is found for the strongest resonances; however, less good agreement is found for the weaker resonances. The results indicate that further theoretical and experimental efforts are necessary to reliably use weak dielectronic satellite lines in plasma diagnostics.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6947915
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 46:7; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HELIUM
ION COLLISIONS
IONS
IRON IONS
ISOELECTRONIC ATOMS
NONMETALS
RARE GASES
RECOMBINATION
RESONANCE
SENSITIVITY ANALYSIS
SPECTROSCOPY
X-RAY SPECTROSCOPY