Theory of photoionization of open-shell atoms
Thesis/Dissertation
·
OSTI ID:6402851
This dissertation comprises four investigations concerning the photoionization of open-shell atoms. The first two are concerned with anisotropic interaction effects on the photoelectron angular distribution of open-shell atoms within the Hartree-Fock approximation. Calculations are carried out for the outer p-subshells of the halogen (F, Cl, Br, and I) and chalcogen (O, S, Se, and Te) atoms as well as for the 3s-subshell of atomic Al. The second two investigations are concerned with the development and application of a many-body treatment of open-shell atom photoionization processes using a transition matrix approach. The aim of this investigation is to treat all particle-hole-type interactions so that theoretical photoionization cross sections for open-shell atoms can be calculated with the same accuracy as are random-phase approximation (RPA) results for closed-shell atoms. A graphical procedure is developed to evaluate each term in the equation satisfied by the first-order transition matrix. For those terms involving the interaction of excited virtual pairs of electrons with the ionic core, the interaction is approximated by allowing no exchange of orbital or spin angular momentum with the ionic core. This approximation leads to the RPA in the closed-shell atom case; it is used to define the RPA here for open-shell atoms. This new open-shell transition matrix approach is applied to the calculation of the photoionization cross section of atomic chlorine.
- Research Organization:
- Nebraska Univ., Lincoln (USA)
- OSTI ID:
- 6402851
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ANISOTROPY
ATOM COLLISIONS
BROMINE
CHLORINE
COLLISIONS
CROSS SECTIONS
DATA
DISTRIBUTION
ELEMENTS
FLUORINE
HALOGENS
HARTREE-FOCK METHOD
INFORMATION
IODINE
IONIZATION
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MATRIX ELEMENTS
NONMETALS
NUCLEAR MODELS
NUMERICAL DATA
OXYGEN
PARTICLE-HOLE MODEL
PHOTOIONIZATION
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
RANDOM PHASE APPROXIMATION
SELENIUM
SEMIMETALS
SULFUR
TELLURIUM
THEORETICAL DATA
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ANISOTROPY
ATOM COLLISIONS
BROMINE
CHLORINE
COLLISIONS
CROSS SECTIONS
DATA
DISTRIBUTION
ELEMENTS
FLUORINE
HALOGENS
HARTREE-FOCK METHOD
INFORMATION
IODINE
IONIZATION
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MATRIX ELEMENTS
NONMETALS
NUCLEAR MODELS
NUMERICAL DATA
OXYGEN
PARTICLE-HOLE MODEL
PHOTOIONIZATION
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
RANDOM PHASE APPROXIMATION
SELENIUM
SEMIMETALS
SULFUR
TELLURIUM
THEORETICAL DATA