Abstract

The theoretical central-field-approximation predictions for the <sup>3</sup><i>P</i> and <sup>1</sup><i>P</i> terms of the 1<i>s</i><sup>2</sup> 2<i>s</i><sup>3</sup><i>p</i> configuration in the <i>N</i>= 4 electron isoelectronic sequence are in violent disagreement with observation. Correlation effects in the form of configuration interaction have been included by considering the mixing among nine odd configurations. Even though the terms are displaced considerably, they remain quite pure, and after configuration mixing the agreement between theory and observation is good. In order to show the use of such theoretical calculation, weighted oscillator strengths for the 2<i>s</i><sup>2</sup><sup>1</sup><i>S</i><sub>1</sub>-2<i>s</i>3<i>p</i><sup>1</sup><i>P</i><sub>1</sub>, <sup>3</sup><i>P</i><sub>1</sub> transitions are also computed.

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