The effect of relaxation and core-hole decay on the M5O3 X-ray fluorescence spectrum of La metal

In the M5O3 X-ray emission spectroscopy (XES) spectrum of La metal the spectral intensity ratio of the satellite to the diagram line is very large, as compared to that of the shakedown satellite to the main line in the M5 X-ray photoelectron spectroscopy (XPS) spectrum. The large spectral intensity ratio is due to the X-ray fluorescence of the shakedown satellite via the relaxation of the M5 main-line state to the shakedown satellite state on the time scale of M5-hole decay. We attribute the large line width of the M5 main-line state of La metal as compared to that of Ba metal, to the relaxation on the time scale of M5-hole decay.