Correlated expansions of n1S and n3S states for two-electron atoms in exponential cosine screened potentials

L. U. ANCARANI; K. V. RODRIGUEZ

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

AMER PHYSICAL SOC

Lugar: New York; Año: 2014 vol. 89 p. 125071 - 125079

1050-2947

Two-electron atoms embedded in a plasma environment are studied with screneed and exponential cosine screened  Coulomb model potentials. Within a configuration interaction approach, and using parameter-free explicitely correlated basis functions, we have calculated the ground-state and first excited-state energies (and other mean values) for H-, He and Li+. We analyze their evolution with the screening parameter provide simple fits, which allow for practical rapid evaluations for example in plasma applications.