New X-Ray Lines in theLSeries Resulting fromKAuger Transitions

Three new x-ray lines in the $L$ series of silver were found which have wave-lengths of 4.030A, 4.016A, and 3.805A. A fourth and much fainter line was found at 4.023A. These lines are due to processes in which an atom, initially ionized in the $K$ shell, undergoes transitions of the type $\{K,\to LL+\mathrm{expelled}\mathrm{electron}(\mathrm{Auger}\mathrm{transition}\left)\mathrm{}\right\}\{\mathrm{LL},\to LM+\mathrm{quantum}(\mathrm{radiative}\mathrm{transition})\mathrm{}.\}$ These lines differ from those previously observed from multiply ionized atoms in that they are more widely separated both from each other and from the diagram lines. An x-ray vacuum spectrograph capable of withstanding a potential of 100 kv across the x-ray tube was used in the observation of these lines. The anode of the x-ray tube was a thin foil of silver backed with aluminum. Special precautions were necessary to suppress the continuous background radiation in the region of the lines as the expected intensity of the lines was of the same order of magnitude as the intensity of the diagram line arising from the transition $L_{\mathrm{III}}$ to $N_{\mathrm{I}}$.