Ground States of Two-Electron Systems in Generalized Exponential Cosine Screened Coulomb Potentials.

K. V. RODRIGUEZ; L. U. ANCARANI; D. MITNIK

Encuentro; Colloque commun de la division Physique Atomique, Moléculaire et Optique de la Societé Francaise de Physique et des Journées de Spectroscopie Moléculaire, PAMO JSM2014; 2014

In this report, we study the ground state of two-electron systems placed in a dense quantum plasma environment, where the three interactions between two particles of charges zi and zj placed at a distance rij can be described by the model potential: V(r)= zi zj Exp(-  λ rij) Cos( δ rij) /rij where λ and δ are two positive real parameters related to the plasma frequency. In the present work, we show results for two-electron systems with the GECSCP model potential. Our calculations are performed with a rather versatile Configuration Interaction approach, with correlated basis functions which explicitly depend on the three interparticle distances and which respect exactly all three cusp conditions.Within the GECSCP model, the evolution of the energy and some radial quantities mean values as a function of λ and δ will be presented at the conference for the He atom, and the H-,  Li+  ions. The effect, on the energy system levels, of considering the exponential and cosine screening parameters equal or not is investigated.