Experimental cross sections for electron-impact ionization of iron ions - Fe(5+), Fe(6+), and Fe(9+)

Physics – General Physics

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Electron Impact, Ground State, Ionization Cross Sections, Iron, Metastable State, Particle Collisions, Autoionization, Electron Beams, Ion Sources, Prediction Analysis Techniques

Scientific paper

Absolute cross sections have been measured for electron-impact ionization of Fe ions of initial charges 5+, 6+, and 9+ from below threshold to 1500-eV collision energies. Distorted-wave calculations including only direct ionization from ground-state ions underestimate the measured peak cross sections by 60-70 percent due to the effects of metastable states and contributions of excitation autoionization to the total cross sections. Ionization rate coefficients and fitting parameters are presented for this data and for Fe(+) and Fe(2+).

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