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Wyszukujesz frazę "Postawa, Zbigniew" wg kryterium: Wszystkie pola


Tytuł:
Molecular dynamics computer simulations of sputtering of benzene sample by large mixed Lennard-Jones clusters
Autorzy:
Rzeźnik, Łukasz
Postawa, Zbigniew
Opis:
Molecular dynamics computer simulations have been used to probe the role of the projectile composition on the emission efficiency and the sample damage. A benzene crystal was bombarded by 15 keV large heterogeneous noble gas clusters containing 2953 atoms. The projectiles used in this study are two-component clusters composed of Ne, Ar, and Kr atoms directed at 0° and 60° relative to the surface normal. It has been found that for normal incidence the total sputtering yield decreases with the projectile mass, whereas for 60° impact angle the yield increases with this quantity. For both 0° and 60° impact angles the observed sputtering yield for heterogeneous clusters cannot be calculated as a sum of sputtering yields obtained for homogeneous projectiles multiplied by the concentration of each component in the multi-component cluster. The difference in deposition scenarios of the primary kinetic energy is shown to be responsible for the observed behavior of the total sputtering yield.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Enhancing ion emission : insights from molecular dynamics and Monte Carlo simulations
Autorzy:
Postawa, Zbigniew
Louerdi, Soukaina
Kański, Michał
Opis:
Gas cluster ion beam (GCIB) guns have found several applications in science and industry, such as surface smoothing or depth profiling and surface analysis in conjunction with secondary ion mass spectrometry (SIMS). The former application is severely hindered by the low amount of ejected secondary ions, which can be boosted by more than an order of magnitude by properly selecting the size of cluster projectiles and changing their constituent particles from argon to water. The mechanism of this phenomenon is still unknown. By combining molecular dynamics (MD) and Monte Carlo (MC) simulations with experimental results, we posit that the increase in ion yield can be attributed to proton transfer in long-lived complexes of sample molecules and hydronium (H3O$^{+}$) ion from the projectile. The number of molecule–water complexes formed in simulations is directly proportional to the experimental signal intensity, with a small deviation for projectiles containing more than 7000 water molecules.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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