Electron-stimulated desorption of Na atoms from the surface of the intermetallic compound CsAu

Electron-stimulated desorption of Na atoms from the surface of the 2D intermetallic compound CsAu was studied upon deposition of Na atoms on it. It was shown that up to a coverage of 0.35 monolayers of Na atoms, the electron-stimulated desorption of Na atoms is associated with the excitation of the core levels of the adsorbate Cs $5s$ and Au 5$p_{3/2}$ and with the excitation of the core level of the adsorbent Na $2p$, and at coverage more than 0.4 monolayers of Na, the electron-stimulated desorption of Na atoms is associated only with the excitation of the core levels of the adsorbate Au $5p_{3/2}$. Two peaks were found in the distribution of the kinetic energies of the desorbed Na atoms, the position and intensity of which depend on the coverage with Na atoms. A model of electron-stimulated desorption of Na atoms associated with the excitation of the core levels of Cs $5s$, Au $5p_{3/2}$ and Na $2p$ is proposed.