THE K–LL AUGER SPECTRUM OF ₇₉Au¹⁹⁷

The K–LL Auger spectrum of 79 Au 197 has been examined in a high-resolving-power beta-ray spectrometer adjusted for a linewidth of 0.1% in momentum. A source of 65-hour Hg 197 was used. A six-line spectrum was observed consisting of the lines K–L 1 L 1 , K–L 1 L 2 , K–L 1 L 3 , K–L 2 L 2 , K–L 2 L 3 , and K–L 3 L 3 . The K–L 1 L 3 line is noticeably wider than the others and the line may be interpreted as consisting of the two components 3 P 1 and 3 P 2 . The energies of the lines are 51.78 ± 0.02, 52.42 ± 0.02, 54.20 ± 0.02, 52.95 ± 0.03, 54.81 ± 0.02, and 56.63 ± 0.02 keV respectively. The relative intensities found were, respectively, 1.00, 1.54 ± 0.11, 0.99 ± 0.09, 0.11 ± 0.03, 1.83 ± 0.13, and 0.75 ± 0.07. Neither the energies nor intensities are in complete agreement with the latest theoretical work.