Radiative Auger Emission Spectra of Sodium Metal and Oxide

Abstract

On energetic grounds has been demonstrated (Aberg and Utriainen 1975, Aberg et al 1980) that the low-energy satellite structure of the Kα1,2 x-ray lines of light elements is caused mainly by KLL and KLV radiative Auger (RA) transitions. The simple shake-off theory (Aberg 1971) predicts the relative KLL RA intensity to be a smooth decreasing function of Z. However, experimentally this seems to be true for oxygen (Linkoaho et al 1976) and for Z > 14, whereas elements 12 ≤ Z ≤ 14 fall below the theoretical curve (Aberg 1975a). In the present work we have measured the Ka low-energy structures of sodium in the metal and its oxide, and made preliminary studies of the halides, obtaining relative intensities and accurate energies of the edges which we interpret as KLL RA transitions: \(1{s^{{\text{ }} - {\text{ }}1}}{\;^2}S \to \left[ {\begin{array}{*{20}{c}} {2{p^{{\text{ }} - {\text{ }}2}}{(^1}S{,^1}D{,^3}P)} \\ {2{s^{{\text{ }} - {\text{ }}1}}2{p^{{\text{ }} - {\text{ }}1}}{(^1}P{,^3}P)} \\ {2{s^{{\text{ }} - {\text{ }}2}}{(^1}S)} \end{array}} \right]\varepsilon \ell {\;^2}P\)