Role of indirect-ionization processes in the electron-impact ionization of Fe/sup 15+/

Journal Article · Sat Apr 15 00:00:00 EDT 1989 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.39.3890· OSTI ID:6450267

Tayal, S S; Henry, R J.W.

We have investigated the contributions of excitation-autoionization and resonant-excitation-double-autoionization indirect-ionization processes to the electron-impact ionization of Fe/sup 15+/ using a close-coupling approximation. The total ionization cross sections are obtained by adding the cross sections for these indirect processes to the direct-ionization cross sections. Eleven autoionizing levels arising from the 2p/sup 5/3s/sup 2/, 2p/sup 5/3s3p, 2p/sup 5/3p/sup 2/, and 2p/sup 5/3s3d configurations, together with the ground 2p/sup 6/3s state, are included in the close-coupling expansion. Large numbers of bound terms of appropriate symmetry are included in the expansion to account for the resonant-excitation-double-autoionization process. The present results are in good agreement with the recent crossed-beam measurement.

• Research Organization: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001
• OSTI ID: 6450267
• Journal Information: Phys. Rev. A; (United States), Vol. 39:8
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
IRON
ELECTRON-ION COLLISIONS
IONIZATION
AUTOIONIZATION
CROSS SECTIONS
EXCITATION
L-S COUPLING
MULTICHARGED IONS
CHARGED PARTICLES
COLLISIONS
COUPLING
ELECTRON COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
INTERMEDIATE COUPLING
ION COLLISIONS
IONS
METALS
TRANSITION ELEMENTS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena