ELECTRON-STIMULATED DESORPTION OF LITHIUM ATOMS ADSORBED ON THE SURFACE OF GOLD-LITHIUM INTERMETALLIC

Получена тонкая пленка интерметаллида LiAu при комнатной температуре при напылении атомов Li на слой адсорбированного золота на поверхности вольфрама. Исследованы процессы электронно-стимулированной десорбции (ЭСД) атомов Li с поверхности LiAu. Показано, что ЭСД атомов Li может наблюлаться только в том случае, когда напылено не менее одного монослоя атомов Li и с Au . Зависимость выхода ЭСД атомов Li от количества напыленного Li и Au имеет максимум при напылении двух монослоев атомов Li на Au. Полученные результаты свидетельствуют о формировании LiAu различной стехиометрии: от LiAu с дефицитом атомов лития до LiAu при напылении двух монослоев атомов Li. В энергетическом распределении по кинетическим энергиям десорбирующихся атомов Li обнаружено два пика: высокоэнергетический и низкоэнергетический. Первый из них связан с десорбцией атомов Li из LiAu, а второй в десорбцией атомов Li из верхнего монослоя атомов Li. A thin film of the intermetallic compound LiAu was obtained at room temperature by deposition Li atoms onto a layer of adsorbed gold on the tungsten surface. The processes of electron-stimulated desorption of Li atoms from the surface are investigated. It is shown that electron-stimulated desorption of Li atoms can be observed only in the case when at least one monolayer of Li and Au atoms is deposited. The dependence of the electron-stimulated desorption yield of Li atoms on the amount of deposited has a maximum when two monolayers of atoms Li are deposited on Au . The results obtained indicate the LiAu formation of various stoichiometry: from with a deficit of lithium atoms to the deposition of two monolayers of atoms. In the kinetic energy distribution of desorbed Li atoms, two peaks were found: high-energy and low-energy. The first of them is associated with the desorption of Li atoms from LiAu, and the second with the desorption of Li atoms from the upper monolayer of Li atoms.

Etching of ZnO films by a focused flow electrons with medium energies (up to 70 keV)

Consideration is given to the results of the study of etching processes ( 200 nm/min) of a ZnO film by a focused electron beam with medium energy (70 keV) under vacuum conditions of 910-5 Pa. It was shown that the construction of a model of the ZnO film etching during electron bombardment, taking into account the likely thermal desorption and electron-stimulated desorption, is not confirmed by calculations. A possible etching mechanism based on the radiolysis caused by Auger decay in near-surface layers of ZnO films is proposed.

Electron stimulated desorption of vanadyl-groups from vanadium oxide thin films on Ru(0001) probed with STM

Electron injection from an STM tip has been used to desorb individual vanadyl groups from vanadium oxide thin films. The underlying mechanism is analyzed from the bias and current dependence of the desorption rate.

Десорбция атомов лития c поверхности Li/Li-=SUB=-x-=/SUB=-Au-=SUB=-y-=/SUB=-, стимулированная электронным облучением

The processes of electron-stimulated desorption (ESD) of Li atoms in the Li/LixAuy Au/W system have been investigated for the first time. The formation of a semiconductor 2D LixAuy layer is revealed. It is shown that ESD processes occur at the interface of the Li monolayer - 2D LixAuy layer.

Influence of radiation-stimulated discharges on the contamination of cover glasses of solar batteries of spacecraft

The results of an AFM study of changes in the surface structure of K-208 and CMG cover glasses after electron irradiation and exposure to molecular fluxes are presented. It is shown that contamination of glass surfaces irradiated with electrons at flux densities (φ) from 1010 to 8·1010 cm–2 s–1 occurs during electrostatic discharges accompanied by the release of plasmoids into the surrounding space, the particles of which are deposited on the glass. It has been experimentally established that the effect of preliminary irradiation of glass on the deposition of molecular flow components is most effective immediately after irradiation and decreases with time. This is due to the drainage of the charge injected into the glass and a decrease in the initially high reactivity of the substances in the discharge channels. It was also shown that the combined effect of electrons and molecular flux on glasses significantly increased the discharge frequency at a given value of φ and, as a result, led to an increase in the number of discharge channels on the sample surfaces. In this case, over time, the process of accumulation of molecular flow components begins to dominate the cleaning of the glass surface due to electron-stimulated desorption and mechanical desorption under the action of shock waves accompanying the discharges. To interpret the experimental results, a mathematical model of the deposition of molecular flow components on glass is proposed.

Электронно-стимулированная десорбция атомов лития из слоев лития на поверхности Li-=SUB=-x-=/SUB=-Au-=SUB=-y-=/SUB=-

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.

ELECTRON-STIMULATED DESORPTION OF POTASSIUM ATOMS ADSORBED ON THE SURFACE OF GOLD

Создан ультратонкий слой интерметаллида KAu при комнатной температуре при напылении атомов калия на слой адсорбированного золота на поверхности вольфрама. Исследованы процессы электронно-стимулированной десорбции атомов K с поверхности KAu. Найдены квазирезонансные пики в зависимости выхода ЭСД от энергии возбуждения при 64 и 82 эВ, которые соответствуют возбуждению остовных уровней Au 5р и Au 5р. Полученные результаты свидетельствуют о формировании KAu различной стехиометрии: от KAu до KAu. Показано, что интерметаллид KAu, полученный при комнатной температуре, как полученный ранее KAu при 1000K, является полупроводником. Предложена модель электронно-стимулированной десорбции атомов K в системе K/KAu/Au/W. An ultrathin intermetallic layer KAuwas created at room temperature by depositing potassium atoms on adsorbed gold layer on the tungsten surface. The processes of electron-stimulated desorption of K atoms from the KAu surface are investigated. Quasi-resonance peaks are found in the dependence of the ESD yield on the excitation energy at 64 and 82 eV, which correspond to the excitation of the core levels Au 5p and Au 5p. The obtained results indicate the formation KAu of different stoichiometry: from KAu to KAu . It is shown that the intermetallic compound KAu created at room temperature is a semiconductor, as it was previously obtained at 1000 K. A model of electron-stimulated desorption of K atoms in the K / KAu / Au / W system is proposed.