Calculation of The Energies of K-shell For Two, Three and Four electron systems Using Hartree -Fock wave function

This study aims to calculate the important atomic possessions such as Two Particle Density ΓHF(r1,r2),the electron-electron radial density distribution D(r1,r2),One-electron radial density distribution D(r1) , the expectation values〈 12 〉, 〈 1 〉,the standard deviation,the inter-electronic distribution function f (r12) and the energy expectation value 〈〉, 〈〉, 〈 〉, 〈 〉, 〈〉. in the K-shell are examined in position space within the ground state in the atoms (He-atom , Li-atom, Be-atom) by using Hartree-Fock wave function.These parameters are very important in studying of physical and chemical possessions of the atoms, and for this purpose a computer program was designed in MATHCAD15 to calculate these parameters for atoms.