Variational calculation of the Intrashell 2p^2 ~3P^e State for Heliumlike F^( 7+) ion

Doubly excited intrashell 2p 2 3P e state in heliumlike F 7+ ion is calculated by using the modified configuration interaction wave function. Using the modified Slater type wave function having up to 362 terms, the energy position of the discrete 2p 2 3P e state in F 7+ is determined to be -18.812 629 78 a.u., Several expectation values of r i,r -1 12 and r 12 are also given in the present work. 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 2p 2 3P e state showing strong correlation effect in two electron systems.