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Experimental cross sections for electron-impact ionization of iron ions: Fe 5 + , Fe 6</mml:…

1986; American Institute of Physics; Volume: 34; Issue: 5 Linguagem: Inglês

10.1103/physreva.34.3657

0556-2791

D. C. Gregory, F. Meyer, A. Müller, P. Defrance,

Laser-induced spectroscopy and plasma

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?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 ${\mathrm{Fe}}^{+}$ and ${\mathrm{Fe}}^{2+}$.