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The correlation between the temperature dependences of ion-induced electron emission yield, modified surface crystalline structure and morphology of isotropic graphite MPG-8 and highly oriented pyrolytic graphite (HOPG) UPV-1T under high-fluence (F=10 18 –10 19 ion/cm 2 ) 6–30keV Ar + ion irradiation has been studied and discussed. The target temperature has been varied...
We report on the experimental energy distributions of electrons emitted in the interaction of slow ions and electrons with aluminium and with monolayer graphite deposited on a Ni(111) surface. Measurements on the Al surface clarify the role of plasmon decay in secondary electron emission. In contrast with theoretical calculations, our experiments indicate that the electron collision cascade inside...
III-Nitrides have attracted much attention due to their versatile and wide range of applications, such as blue/UV light emitting diodes. Strained layer super lattices offer extra degree of freedom to alter the band gap of lattice-mismatched heterostructures. Swift heavy ion irradiation is a post-growth technique to alter the band gap of semiconductors, spatially. In the present study, strained AlGaN/GaN...
A new method of stopping power measurement for fast incident particles penetrating through solid and liquid targets is developed. In this method, thin cylindrical targets are employed and it enables us to obtain the stopping powers in a rather wide range of projectile energies according to a certain incident energy. In this report, we demonstrate our recent experimental results for a metal wire of...
The Time of Flight spectra of atomic D + , molecular D2+ and D3+ ions specularly reflected from a polycrystalline Ni surface at the same velocity (1 keV/u) and grazing angle of 4° are used to study the dissociation mechanism of the triatomic molecule. As in the case of D2+ previously investigated, a quick and complete fragmentation induced by resonant neutralisation of D3+ on the incoming...
Low-Energy Ion Scattering (LEIS or ISS) is used to selectively analyze the atomic composition of the outer atomic layer of surfaces. In addition, the spectrum gives (non-destructively) the in-depth distribution. Using a double toroidal energy analyzer with parallel energy detection and time-of-flight filtering a high sensitivity and mass resolution of LEIS is achieved. This is demonstrated for a highly...
Resonant neutralization of 50eV Na + ions impinging on Cu(100) surfaces is studied, focusing on events where the incident particle undergoes multiple collisions within the first surface layers of the samples. Specific trajectories are generated, via molecular dynamics simulations, in which the projectile comes out interacting, on long time scales, either with a single surface atom or with...
Molecular dynamics (MD) simulations of large argon clusters impacting on silicon targets were performed. The characteristics of crater formation, a typical collisional effect with large cluster impact were examined from the viewpoint of incident energy, cluster size and incident angle. The MD simulation results suggested that the condition where an incident cluster penetrates into the solid target...
The secondary electron (SE) emission for Ga ion, He ion and electron impact have been calculated using Monte-Carlo simulations, in which the trajectories of all the collision partners (i.e., primary ions, recoiled target atoms, and excited electrons (electron cascade) along which SEs are excited) have been simulated. The SE yields for Ga ion impact show a gradual decrease with increasing Z 2 ...
Pronounced suppression of electron emission from surfaces bombarded by fast clusters is one of the well-known vicinage effects. However, the main mechanism of the suppression still remains unsolved. In this paper, recent electron spectroscopy studies of the vicinage effect at Tsukuba are reviewed with emphasis on the suppression mechanism of the electron emission in the transport stage. We discuss...
The effect of implantation parameters on damage build-up in ZnO bombarded with Bi and Er ions is studied by Rutherford backscattering/channelling spectrometry. The results show that the damage accumulation behaviour in ZnO is different dramatically from that in other semiconductors. In particular, a variation of implantation parameters, such as collision cascade density, sample temperature and ion...
Si-rich oxide films (SiO x , 0<x<2) were synthesized by reactive magnetron sputtering of a single Si target in a gas mixture of argon and oxygen. Intense visible electroluminescence was observed from the as-deposited SiO x film. The microstructure of the as-sputtered SiO x films was characterized by Raman and X-ray photoelectron spectroscopy techniques. Nanoscale amorphous...
We report an electron spectroscopy study on Na + ion implantation and Na atom deposition on carbon structures. Our results show that, for implanted Na at the same ion dose, the Na surface concentration decreases with the structure order, while deposited Na particles readily diffuse in the bulk.
We have measured stopping cross-sections of liquid water for fast H + ions in an energy range from 0.3 to 2.0 MeV. The liquid water target was prepared in vacuum by using a liquid molecular jet technique. The energy and angular distribution of outgoing projectiles after passing through the liquid target were measured at various scattering angles ranging up to 50 mrad. The experimental results...
Investigations of the main parameters of ion–photon emission during Ar + ion bombardment of Fe and Co metals and Fe–Co alloys have been made. It was shown that the dependence of the quantum yields of the emissions of ejected excited Fe and Co atoms on the concentration of corresponding elements in the alloys generally decreased but showed local maxima. These maxima are related to concentrations...
Muscovite mica was irradiated with slow highly charged Ar q+ (charge state q=12, 16) and Xe q+ (q=23, 27) ions in a kinetic energy range of 150–216keV and subsequently observed by contact mode atomic force microscopy. Surprisingly, on samples irradiated with Xe ions nano-sized hillock-like structures were found well below the charge state threshold reported in earlier experimental...
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