Abstract
Doubly excited intrashell 2p2 3Pe states in heliumlike N5+ and O6+ ions are calculated by using the original Slater-type wave function and the modified configuration interaction wave function. Using the modified Slater-type wave function having up to 393 and 276 terms for N5+ and O6+, we predicted the energy positions of the discrete 2p2 3Pe states for these two heliumlike ions. They are -11.140748676 a.u. and -14.726670741 a.u., respectively. Several expectation values of rin and r12m (-1 ⩽ n ⩽ 1, and -1 ⩽ m ⩽ 2) are also given in the present letter. The present results indicate that the modified Slater-type wave function in which r< and r> coordinates are incorporated is effective and powerful for the description of the 2p2 3Pe state showing strong correlation effect in two-electron systems.
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