Charge exchange processes involving iron ions

Abstract

A review and evaluation is given of the experimental data which are available for charge exchange processes involving iron ions and neutral H, H2 and He. Appropriate scaling laws are presented, and their accuracy estimated for these systems. A bibliography is given of available data sources, as well as of useful data compilations and review articles. A procedure is recommended for providing single approximate formulae to the fusion community to describe total cross sections for electron capture by partially-stripped Fe < l + ions in collisions with H, H2 and He, based on the scaling relationships suggested by Janev and Hvelplund.

ASCA observation of X-ray emission from the Galactic ridge

“…The charge exchange cross section depends strongly on the ion energy (see e.g. Phaneuf et al 1987). For the interaction of Fe +q ions with H or H 2 , the cross section rises steeply as the ions lose energy, in proportion to E −4.5 when Eq −1/2 25 keV/nucleon.…”

IONIZATION BALANCE FOR OPTICALLY THIN PLASMAS: RATE COEFFICIENTS FOR Cu, Zn, Ga, and Ge IONS

“…For the four elements considered only scaled cross sections versus scaled energy are available [42][43][44]. According to Janev et al [42] the proposed formulae represent (with a r.m.s.…”

Examination of Correlation of Surface Morphologies of Top-Silicon and Buried Oxide Layers in High-Temperature-Annealed Separation by IMplanted OXygen Wafers

“…The absolute CS for oneelectron capture by Fe q+ ions in hydrogen and/or He have been reported by Gardner et al (1977), Meyer et al (1979), Crandall et al (1980) and Phaneuf (1983). Through the analysis of experimental and theoretical results for different HCI/target combinations, general scaling rules for charge-exchange CS have been established for Fe ions by Phaneuf et al (1987), and summarized and extended to some additional cases by Janev et al (1995).…”

“…Knowing the cross sections (CSs) for these processes is therefore of importance for interpreting the observed spectra from different solar-system objects. Closer to home, Fe ions are present as impurities in fusion plasmas (Phaneuf et al 1987, Janev 1995. Their collisions with neutral atoms and molecules from the edge plasma are important for modelling the plasma-wall interaction.…”

“…Interest in charge-exchange collisions of Fe q+ with hydrogen and He has been sparked by fusion plasma research (Phaneuf et al 1987. The absolute CS for oneelectron capture by Fe q+ ions in hydrogen and/or He have been reported by Gardner et al (1977), Meyer et al (1979), Crandall et al (1980) and Phaneuf (1983).…”