Many-body correlation effects in the ionization of atoms by electrons and photons
Thesis/Dissertation
·
OSTI ID:5829399
Many-body perturbation theory has been used to investigate the effects of electron correlations for three cases of the ionization of atoms by photons and electrons. The results of the calculations are compared with experiments and other calculations. The author calculated the photoionization cross sections for the 4d, 4f, 5s, 5p, and 6s electrons of the Eu atom in the photon energy range near the 4d{sup 10}4f{sup 7}{yields}4d{sup 9}4f{sup 8} resonance at 141eV. Electron interactions between different ionization channels were included in the calculation. The asymmetry parameters for the angular distributions of the photo-electrons were also calculated. He has calculated the photoionization cross sections of the Ar atom for the production of singly and doubly charged ions by photons of energies between 100eV and 290eV. Effects of correlations involving 2p excitations on both the single and double ionization cross sections were included. He has studied the impact ionization of the He atom by electrons with energies ranging from the threshold at 24.6eV up to 800eV. The distorted wave approximation was used in calculations of the total cross section and the differential cross section in energy, and the optical potential method was used to investigate electron correlation effects in the initial state of the He atom.
- Research Organization:
- Virginia Univ., Charlottesville, VA (USA)
- OSTI ID:
- 5829399
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
COLLISIONS
COMPARATIVE EVALUATIONS
CROSS SECTIONS
DATA
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY RANGE
EUROPIUM
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
FLUIDS
GASES
HELIUM
INFORMATION
IONIZATION
MANY-BODY PROBLEM
METALS
NONMETALS
NUMERICAL DATA
PERTURBATION THEORY
PHOTOIONIZATION
RARE EARTHS
RARE GASES
THEORETICAL DATA
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
COLLISIONS
COMPARATIVE EVALUATIONS
CROSS SECTIONS
DATA
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY RANGE
EUROPIUM
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
FLUIDS
GASES
HELIUM
INFORMATION
IONIZATION
MANY-BODY PROBLEM
METALS
NONMETALS
NUMERICAL DATA
PERTURBATION THEORY
PHOTOIONIZATION
RARE EARTHS
RARE GASES
THEORETICAL DATA