Abstract
An apporach is presented in order to study the interelectronic correlation in few-electron atomic or molecular systems. The main point is that the correlation is described as a mutual collision between all the electrons. This approach allows the determination of simple wave functions for complex systems including only three parameters, with a clear physical meaning. The method is applied to study three- and four-electron systems in different states, including the so-called hollow states for lithium and beryllium. The overall results are found to be in good agreement with those deduced using much more sophisticated wave functions. Subsequently, the present wave functions are chosen as trial wave functions in the diffusion Monte Carlo method. This approach leads to a very accurate determination of the ground-state energies of lithium, lithium negative ion, and beryllium atoms, indicating that it becomes possible to deduce with very good accuracy some properties of relatively complex systems with a quite simple wave function.
Published Version
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