Superposition of Configurations: The Helium Atom

The Structure of the Helium Atom.

Semiclassical theory of helium atom

Quantum Electrodynamics of the Helium Atom

Using singlet S states of the helium atom as an example, I describe precise calculation of energy levels in few-electron atoms. In particular, a complete set of effective operators is derived which generates O(mα6) relativistic and radiative corrections to the Schrödinger energy. Average values of these operators can be calculated using a variational Schrödinger wave function. 31.30.Jv, 12.20.D...

Classical limit states of the helium atom

The techniques of Rydberg electronic wave packets are used to explore the classical limit states of helium. A class of shape-preserving orbits is studied under the classical adiabatic approximation that separates the dynamics of the two electrons. These states form the classical basis for two-electron wave packet states whose hydrogenic counterparts are shown to be elliptic states in the presen...

Rydberg States of the Helium Atom

Using the recently introduced maximum overlap method and Hartree–Fock Perturbation Theory (HFPT), we compute Hartree–Fock (HF) wavefunctions for triplet 1s ns states of the helium atom. Comparison with near-exact results from Nakatsuji’s free ICI method reveals that HF theory provides a simple route to accurate energies of these Rydberg states, especially for large n. © 2009 Wiley Periodicals, ...