Resonance parameters and properties of beryllium-like doubly excited states: 4 ≤ Z ≤ 10

Comparison of doubly-excited helium energy levels, isoelectronic series, autoionization lifetimes, and group-theoretical configuration-mixing predictions with large-configuration-interaction calculations and experimental spectra

David R. Herrick, Oktay Si̇nanoğlu · Physical review. A, General physics · 1975 · 447 citations

Natural Sciences, Physics, Atomic Physics +16

Compound-Atom States for Two-Electron Systems

Thomas F. O'Malley, S. Geltman · Physical Review · 1965 · 285 citations

Natural Sciences, Physics, Quantum Chemistry +14

Energy levels and classifications of doubly-excited states in two-electron systems with nuclear charge, Z = 1, 2, 3, 4, 5, below the N = 2 and N = 3 thresholds

Lester Lipsky, Russell Anania, Michael Conneely · Atomic Data and Nuclear Data Tables · 1977 · 242 citations

Natural Sciences, Physics, Nuclear Physics +12

Approximated dynamical symmetry of two-electron atoms

Carl E. Wulfman · Chemical Physics Letters · 1973 · 134 citations

Natural Sciences, Physics, Atomic Physics +12

Autoionisation states of helium isoelectric sequence below the n=3 hydrogenic thresholds

Y. K. Ho · Journal of Physics B Atomic and Molecular Physics · 1979 · 122 citations

Natural Sciences, Physics, Condensed Matter Physics +5