Low energy range dielectronic recombination of Fluorine-like Fe17+ at the CSRm

Abstract

The accuracy of dielectronic recombination (DR) data for astrophysics related ions plays a key role in astrophysical plasma modeling. The measurement of the absolute DR rate coefficient of Fe17+ ions was performed at the main cooler storage ring at Institute of Modern Physics, Lanzhou, China. The experimental electron-ion collision energy range covers first Rydberg series up to n = 24 for the DR resonances associated with the 2P1/2--2P3/2 dn = 0 core excitations. A theoretical calculation was performed by using FAC code and compared with the measured DR rate coefficient. Overall reasonable agreement was found between the experimental results and calculations. Moreover, plasma rate coefficient was deduced from the experimental DR rate coefficient and compared with the available results from the literature. At the low energy range significant discrepancies were found therein and the measured resonances challenged state-of-the-art theory at the low collision energies.

arXiv commentto be published in Chinese Physics C

References in corpus (16)

• Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
• Ionization balance for optically thin plasmas: rate coefficients for all atoms and ions of the elements H to Ni
• Chandra X-Ray Observatory (CXO):Overview
• Photoionization Modeling and the K Lines of Iron
• A new approach to analyzing solar coronal spectra and updated collisional ionization equilibrium calculations. II. Additional ionization rate coefficients
• The Ionized Gas and Nuclear Environment in NGC 3783. IV. Variability and Modeling of the 900 ks CHANDRA Spectrum
• Complex resonance absorption structure in the X-ray spectrum of IRAS13349+2438
• Atomic Data for X-ray Astrophysics
• Collisional Ionization Equilibrium for Optically Thin Plasmas. I. Updated Recombination Rate Coefficients for Bare though Sodium-like Ions
• Warm absorbers in active galactic nuclei
• Dielectronic Recombination in Photoionized Gas. II. Laboratory Measurements for Fe XVIII and Fe XIX
• Experimental Mg IX photorecombination rate coefficient
• Dielectronic recombination of lithium-like Ni25+ ions - high resolution rate coefficients and influence of external crossed E and B fields
• Dielectronic recombination of Fe^{13+}: benchmarking the M-shell
• Modeling of Photoionized Plasmas
• Electron-ion Recombination of Fe XII forming Fe XI: Laboratory Measurements and Theoretical Calculations