Two-electron rearrangement K x-ray transitions in Na, Mg, and Al metals

One-photon KL2,3ⁿ ($n=1,2$) radiative electron rearrangement (KLⁿ RER) x-ray transitions have been observed in sodium, magnesium, and aluminum metals following electron-impact excitation. The structure of the KLⁿ RER transitions has been separated from the KLL and KL₁V radiative Auger (RA) structure and their intensity relative to the KL2,3ⁿ-L2,3ⁿ⁺¹ transitions has been determined. No significant discrepancy between the experimental and calulated KL¹ RER branching ratios has been found in contrast to recent ion-impact results of Jamison et al. for aluminum and silicon. Our KL² RER results also agree with theoretical predictions.