Behavior of Lβ2 visible satellites in gold around L1 threshold

The Au Lβ2 visible satellites, Lβ2′ and Lβ2″ were measured around the L1 absorption edge using a high-resolution Johann-type spectrometer at BL15XU, SPring-8. The relative intensities of the Lβ2′ and Lβ2″ satellites to that of the Lβ2 line exhibit an abrupt jump at the L1 threshold. The results suggest that the origin of the Lβ2 satellites is mainly the L1-L3M4,5 Coster-Kronig transitions.