Auger electron intensity measurements have been made on ${\mathrm{Cs}}^{137}$, ${\mathrm{Au}}^{198}$, and ${\mathrm{Sn}}^{113}$ with a magnetic lens spectrometer which is briefly described. $K$ Auger yields for Ba and Hg of 0.130±0.007 and 0.056±0.008, respectively, were obtained. The $K$ Auger electrons were resolved into three groups, $K-LL$, $K-LX$, and $K-XY$, according as two, one, or no $L$ electrons were involved. The ratios of the intensities of the latter two to the $K-LL$ were found to be for In 0.417±0.016 and 0.076±0.008; for Ba 0.40±0.04 and 0.08±0.02. The measured ratio of $K-LX$ to $K-LL$ for Hg was 0.71±0.15. The relationship of these results to theory is discussed. A summary of measurements of $K$ fluorescence yield and $K$ Auger line intensity ratios is given. The Auger spectrum from ${\mathrm{Au}}^{198}$ indicates that $K$ capture to ${\mathrm{Pt}}^{198}$ cannot occur in more than 0.5 percent of the disintegrations. A crude estimate of the $L$ to $K$ capture ratio for ${\mathrm{Sn}}^{113}$ indicates that it is not abnormally high.

• Received 18 August 1952

DOI:https://doi.org/10.1103/PhysRev.89.715