Figure 1

(a) Photoemission spectra of the Mg $K{L}_{23}{L}_{23}$ Auger transition of the 3 ML MgO film for polar angles of 0°, 20°, and 45°. Best fit and layer-by-layer decomposition are also shown. (b) Experimental AED polar scans of the $C_1$, $C_2$, and $C_3$ Auger components in the (100) emission plane. (c) Calculated Mg $K{L}_{23}{L}_{23}$ AED profiles at 1177 eV in the (100) emission plane. The blue, green, and orange curves correspond respectively to calculations for Mg atom emitters in the first, second, and third layer above the $\mathrm{MgO}/\mathrm{Ag}(001)$ interface.Reuse & Permissions

Figure 2

(a) Photoemission spectra of the Mg $K{L}_{23}{L}_{23}$ Auger transition of the 3 ML MgO film for polar angles of 0°, 20°, and 45° after exposition to a Mg atomic flux. Best fit and layer-by-layer decomposition are also shown. (b) Comparison between experimental (bottom curve) and calculated modulation functions associated with the $C_0$ component along the [100] direction for different configurations with Mg atoms occupying substitutional sites of the Ag substrate. The basic cells used for the multiple scattering calculations are reported on the right side. The red, grey, and blue atoms correspond, respectively, to oxygen, silver, and Mg scatterers. The incorporated Mg emitter atom is also shown in green.Reuse & Permissions

Figure 3

(a) Variations of the work function $\Delta \varphi$, MgO-valence band position $\Delta \mathrm{VB}$ and kinetic energies of the $C_2$ ($\Delta C_2$) and $C_3$ ($\Delta C_3$) Auger components as a function of the Mg exposure time for a 3 ML $\mathrm{MgO}/\mathrm{Ag}(001)$ sample. The evolutions are plotted in semilogarithmic representation. (b) Comparison between DFT-calculated and experimental work function changes $\Delta {\varphi }^{\mathrm{BO}}$ as a function of the Mg concentration at the metal-oxide interface. $\Delta {\varphi }^{\mathrm{BO}}$ reflects the BO variations at the metal-oxide interface.Reuse & Permissions