Frequency-dependent multipole polarizabilities. II. Application of a reduced Green's function formulation of TDHF theory to the helium isoelectronic sequence

Journal Article · Fri Sep 15 00:00:00 EDT 1978 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.436936· OSTI ID:6734128

McDowell, K; Lewis, L

A reduced Green's function formulation of time-dependent Hartree--Fock theory is developed using diagrammatic techniques. The resulting integral equations are transformed using a power moment approach. An asymptotic ansatz of the form exp)-(-2(epsilon/sub i/ minus-or-plus..omega..))/sup 1/2/r)amdagger polynomial is used to fit the radial functions phi/sup + -//sub l/(r). From these functions, the frequency-dependent dipole, quadrupole, and octapole polarizabilities of the helium isoelectronic sequence for Z=2--10 are calculated. Results are reported for the static case. It is found that the poles of the polarizabilities which correspond to TDHF excitation energies from the ground state can be accurately determined for highly excited states. These excitation energies are reported and are related to a Rydberg formula. The resulting quantum defects are also reported.

• Research Organization: Department of Chemistry and Geology, Clemson University, Clemson, South Carolina 29631
• OSTI ID: 6734128
• Journal Information: J. Chem. Phys.; (United States), Vol. 69:6
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC IONS
POLARIZABILITY
HELIUM
DEFECTS
GREEN FUNCTION
ISOELECTRONIC ATOMS
ATOMS
CHARGED PARTICLES
CRYOGENIC FLUIDS
ELECTRICAL PROPERTIES
ELEMENTS
FLUIDS
FUNCTIONS
IONS
NONMETALS
PHYSICAL PROPERTIES
RARE GASES
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory