Resonance and intermediate-coupling effects in electron scattering with highly charged ions. II. Autoionization and dielectronic recombination

Journal Article · Sat Oct 01 04:00:00 EDT 1983 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.28.2128· OSTI ID:5388357

Pradhan, A K

The role of resonances in electron-impact excitation of highly charged ions is examined and some methods are described in order to take account of autoionization and dielectronic recombination. The intermediate-coupling calculations of paper I are extended to include these processes and effective collision strengths are obtained. Results are presented to illustrate particular features in a number of transitions in Fe/sup 24 +/ and Mo/sup 40 +/. Resonance analysis is carried out employing numerical interpolation techniques and multichannel quantum-defect theory, employing reactance matrices in nine-state close-coupling and distorted-wave approximations. It is shown that all three effects considered in the present study, departure from LS coupling, resonance enhancement due to autoionization, and reduction in autoionization enhancement due to dielectronic recombination, can be of considerable importance in the cross sections of highly ionized systems. In the high-Z ions of the helium isoelectronic sequence the contribution of autoionizing resonances remains large even after all probable radiative channels are included, although the net autoionization effect decreases with Z.

• Research Organization: Department of Physics, University of Windsor, Windsor, Ontario, Canada
• OSTI ID: 5388357
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 28:4; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
AUTOIONIZATION
CHARGED PARTICLES
COLLISIONS
COUPLING
DISTORTED WAVE THEORY
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ELEMENTS
FLUIDS
GASES
HELIUM
INTERMEDIATE COUPLING
ION COLLISIONS
IONIZATION
IONS
IRON IONS
ISOELECTRONIC ATOMS
MOLYBDENUM IONS
MULTICHARGED IONS
NONMETALS
RARE GASES
RECOMBINATION
RESONANCE