Izvorni znanstveni članak
Influence of correlation function on evaluation of the correlation energy for the pair (Is ↑ Is ↓) of the Be atom and its isoelectronic series
Mohamed T. Ismaiel
; Faculty of Education, Ain Shams Univ., Heliopolis, Cairo, Egypt
Kawthar A. Kamel
; Faculty of Science (for girls), Al Azhar Univ., Nasr City, Cairo, Egypt
Khaled M. A. Eid
; Faculty of Education, Ain Shams Univ., Heliopolis, Cairo, Egypt
Mohamed A. Kamel
; Faculty of Education, Ain Shams Univ., Heliopolis, Cairo, Egypt
Sažetak
The influence of various correlation functions is studied and applied to the pair (Is ↑ Is ↓) of Be atom and its isoelectronic series in ground states. Two-particle approximation is used for the evaluation of the correlation energies Ec. This method allows the evaluation of Ec for different pairs separately. In the ground state of Be atom, values of Ec obtained using functions of the type χ = β (r1 + r2)φ, χ = (αr12 + β (r1 + r2))φ and χ = (αr12 + yr12 (r1 + r2))φ agree with the exact values. Results approaching 96% of the exact values are obtained using functions of the type χ = [αr12 + β (r1 + r2) + yr12 (r1 + r2)] φ.
Ključne riječi
Hrčak ID:
331478
URI
Datum izdavanja:
7.5.1989.
Posjeta: 340 *