Abstract
The aim of this work is evaluation of the correlation energy Ecorr, repulsion energy between electrons 〈 〉 ,attraction energy between electrons and nucleus 〈 〉 ,electron density at the nucleus ,one-electron expectation value 〈 〉 and inter -electron expectation value 〈 〉 (where k is an integer takes the value -2,-1,1,2) for some ions Si +11 ,P +12 ,S +13 ,All these results in atomic unit .
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