Table 2.

Atoms calculated total energies by the Hartree–Fock; the OPM, the LDA, and GGA techniques (in a.u.). Reproduced with permission from [82]. Copyright 1998, Elsevier Science Ltd.

Atom	Exp.	HF	OPM	LDA	GGA
He	−2.9037	−2.8617		−2.975	−2.8989
C	−37.8450	−37.6886	−37.6865	−38.0522	−37.8243
Ne	−128.939	−128.547	−128.546	−129.317	−128.945
Si	−289.383	−288.854	−288.850	−289.912	−289.368
Cl	−460.217	−459.482	−459.477	−460.838	−460.162