Abstract
Oscillator strengths of both length and velocity forms, for the inner-shell excitation 1s 22s 22p 63s 2 SskJ/e→1s 22s 22p 53s 22 PskJ/0 transition in the sodium isoelectronic sequence have been calculated employing the Tiwary approach for the configuration interaction effect and the Breit-Pauli approach for the relativistic effect. Our results demonstrate that the configuration interaction effect is more important than the relativistic effect for the lowly ionized atoms and the reverse is true for the highly ionized atoms.
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