Исследованы концентрационные зависимости электронно-стимулированной десорбции (ЭСД) атомов Cs и Na при адсорбции на неметаллических покрытиях, выращенных на W-подложке. Обнаружено, что процессы ЭСД происходят в интерфейсе адсорбированный слой-неметаллическая подложка. Показано, что спад в концентрационной зависимости выхода ЭСД, наблюдающийся после достижения монослойного покрытия, связан с уменьшением количества возбуждающих ЭСД электронов, достигающих интерфейса. DOI: 10.21883/PJTF.2017.14.44827.16777
Electron-stimulated desorption of K atoms from the surface of potassium atoms on KxAuy was discovered. A KxAuy layer on a tungsten substrate with a gold film deposited on it with a thickness of not more than 5 atomic layers of gold. A quasi-resonant dependence on the energy of the exciting electrons of the electron-stimulated desorption was found. The quasi-resonance dependence is due to the excitation of core levels of Au 5p3/2 and Au 5p1/2. A model of electron-stimulated desorption of K atoms in the K/KxAuy system is proposed that adequately describes the processes that occur during electron-stimulated desorption of potassium atoms. The processes of electron-stimulated desorption excitation of potassium atoms occur at the K/KxAuy interface.
For the first time, semiconductor 2D layers LixAuy have been created on the surface of gold deposited on a tungsten substrate. The processes of electron-stimulated desorption (ESD) of Li atoms in the Li / LixAuy / Au / W system are studied. It is shown that ESD processes occur in the Li monolayer and the LixAuy layer closest to it. A model of ESD of Li atoms in the Li / LixAuy / Au / W system is proposed.
We have analyzed electron-stimulated desorption (ESD) of neutral sodium and potassium atoms on oxidized tungsten. We propose a model describing ESD of atoms from the oxidized tungsten surface.
Electron stimulated desorption (ESD) of neutral atomic Cs from graphene on Ir has been studied for two cases: when Cs intercalation does present and when it does not take place. Two peaks have been found at desorbed atom energy distribution: high-energy (HE) at the energy of 0.36 eV and low-energy (LE) one at the energy of 0.13 eV. HE peak has been observed for both cases, we attribute it with excitation of 2s carbon core level. LE peak was observed only when intercalation does not take place; we attribute it with excitation of 4f and 5p core levels of Ir. A model is put forward to describe atomic Cs ESD; we proposed that graphene on Ir acts as dielectric in the processes discussed above.
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