User:Sindhukannur./sandbox

Relativistic Random Phase Approximation
Hydrogen atom is a single electron system and we can solve its solution analytically. In many electron systems (More than one) it is difficult to get exact solutions for Schrödinger equation because one has to take care of the electron-electron interaction potentials. so we have to look for some approximate solutions. One approximation method is Relativistic analogue of Random Phase Approximation (RRPA) and was developed by Johnson and co workers. In RRPA the electron correlations are included such that the solutions are expected to be approximate reality.