Rapid relativistic distorted-wave approach for calculating cross sections for ionization of highly charged ions

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.42.5378· OSTI ID:5912323

Zhang, H L; Sampson, D H ^[1]

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1. Department of Astronomy, The Pennsylvania State University, University Park, PA (USA)

The rapid relativistic distorted-wave method of Zhang, Sampson, and Mohanty (Phys. Rev. A 40, 616 (1989)) for excitation, which uses the atomic-structure data of Sampson {ital et} {ital al}. (Phys. Rev. A 40, 604 (1989)), has been extended to ionization. In this approach the same Dirac-Fock-Slater potential evaluated using a single mean configuration is used in calculating the orbitals of all electrons bound and free. Values for the cross sections {ital Q} for ionization of various ions have been calculated, and generally good agreement is obtained with other recent relativistic calculations. When results are expressed in terms of the reduced ionization cross section {ital Q}{sub {ital R}}, which is proportional to {ital I}{sup 2}{ital Q}, they are close to the nonrelativistic Coulomb-Born-exchange values of Moores, Golden, and Sampson (J. Phys. B 13, 385 (1980)) for hydrogenic ions except for high {ital Z} and/or high energies. This suggests that fits of the {ital Q}{sub {ital R}} to simple functions of the impact electron energy in threshold units with coefficients that are quite slowly varying functions of an effective {ital Z} can probably be made. This would be convenient for plasma-modeling applications.

• DOE Contract Number: FG02-85ER53208
• OSTI ID: 5912323
• Journal Information: Physical Review, A; (USA), Journal Name: Physical Review, A; (USA) Vol. 42:9; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
CROSS SECTIONS
DISTORTED WAVE THEORY
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ION COLLISIONS
IONIZATION
PLASMA SIMULATION
SIMULATION