Two-electron rearrangementKx-ray transitions in Na, Mg, and Al metals

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