Channel-interaction effects on the chlorine 3P-subshell photoionization cross sections and photoelectron angular distributions

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1981

OSTI ID:5421413

Fielder, W R

In this investigation the photoionization cross sections and photoelectron angular distributions (asymmetry parameters) were obtained for 3p-subshell ionization of the chlorine ground state using the multiconfiguration Hartree-Fock (MCHF) technique. By employing a multiconfiguration description of the ground state and residual ionic core, a substantial amount of electron correlation could be taken into account. Both the independent-channel and channel-interaction final states were used in evaluating the length and velocity forms of the dipole transition amplitudes. This accommodation of channel interaction was performed via the reaction matrix (K-matrix) method which diagonalized the total N-electron atomic Hamiltonian in the manifold of single-channel basis states of the model Hamiltonian (Hartree-Fock). For 3p-subshell ionization the residual ion can produce three LS-coupled multiplets: Cl/sup +/(3p/sup 4/,/sup 3/P), CL/sup +/(3p/sup 4/,/sup 1/D), and Cl/sup +/(3p/sup 4/,/sup 1/S) in order of ascending ionization thresholds. From the conditions imposed by the electric dipole transition operator, the 3p/sup 5/,/sup 2/P ground state can undergo a photoionization transition to either a /sup 2/D, /sup 2/P, or /sup 2/S final state. These ionic and final state multiplets, taken together with the dipole operator constraint on the possible photoelectron orbital angular momentum quantum numbers, yield a large number of channels resulting from the n = 3 shell ionization which interact through the Coulomb operator. In all cases the photoabsorption transition probabilities exhibit a significant amount of channel interaction. For the partial cross sections of the /sup 2/D and /sup 2/P channels the K-matrix values are all depressed at threshold with respect to the Hartree-Fock values.

• Research Organization: Johns Hopkins Univ., Baltimore, MD (USA)
• OSTI ID: 5421413
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CHLORINE
INNER-SHELL IONIZATION
PHOTOIONIZATION
ANGULAR DISTRIBUTION
BOUND STATE
CHANNELING
CHLORINE IONS
COUPLING
CROSS SECTIONS
ELECTRONIC STRUCTURE
ENERGY ABSORPTION
GROUND STATES
HARTREE-FOCK METHOD
INTERACTIONS
K MATRIX
MULTIPLETS
QUANTUM OPERATORS
TRANSITION AMPLITUDES
ABSORPTION
AMPLITUDES
CHARGED PARTICLES
DISTRIBUTION
ELEMENTS
ENERGY LEVELS
HALOGENS
IONIZATION
IONS
MATHEMATICAL OPERATORS
MATRICES
NONMETALS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena