The Experts below are selected from a list of 39522 Experts worldwide ranked by ideXlab platform
A V Samartsev - One of the best experts on this subject based on the ideXlab platform.
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kinetic energy distributions of neutral in and in2 sputtered by polyatomic ion Bombardment
Applied Surface Science, 2006Co-Authors: A V Samartsev, A WucherAbstract:Kinetic energy distributions of neutral In monomers and In2 dimers sputtered from a polycrystalline indium surface under Bombardment with 5 keV/atom Au1 � and Au2 � projectiles havebeen investigatedbymeans of laserpostionizationtime-of-flight massspectrometry. Results show that 5 keVAu1 Bombardment leads to results in full compliancewith linear cascade sputtering theory. Forpolyatomic ion Bombardment, we find a clear transition to a collisional spike dominated emission process. The spike contribution appears as a low-energy part in the sputtered flux which increases with increasing projectile nuclearity and energy. We show that, the velocity spectrum associated with the low-energy contribution is virtually identical for sputtered monomers and dimers. This finding has important implications with respect to the particle emission mechanism under polyatomic projectile Bombardment. # 2006 Elsevier B.V. All rights reserved.
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sputtering of indium using aum projectiles transition from linear cascade to spike regime
Physical Review B, 2005Co-Authors: A V Samartsev, A Duvenbeck, A WucherAbstract:We have investigated the yields and emission velocity distributions of neutral In atoms and In2 dimers sputtered from a pure indium surface under Bombardment with Aum − m=1,2 ,3 projectile ions. It is shown that 5-keV Au1 Bombardment leads to results in full compliance with linear cascade sputtering theory. All polyatomic projectiles are found to generate an additional low-energy contribution to the sputtered flux, which increases with increasing projectile nuclearity and energy and completely dominates the spectra under 10-keV Au3 Bombardment. Analysis shows that this contribution cannot be explained in terms of thermal spike sputtering models. Instead, the results indicate a spike emission mechanism, which closely resembles a free expansion of a supercritically heated subsurface volume.
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comparative study of kinetic energy spectra and mass distributions of tan ions sputtered from tantalum by atomic and molecular ion Bombardment
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 1998Co-Authors: S F Belykh, A V Samartsev, Kh U Rasulev, I V VeryovkinAbstract:Abstract Mass distributions and kinetic energy spectra of Ta n + ions ( n ≤ 12) sputtered from a tantalum target by Au m − primary ions ( m = 1,2,3), with energies of 6 keV per constituent atom, have been determined under identical experimental conditions. Under the molecular ion Bombardment, anomalous high non-additive sputtering yields were observed for large metal clusters. For instance, a relative yield of Ta 10 + clusters under Au 3 − molecular ion Bombardment was observed approximately 2000 times higher than that under Au − atomic ion Bombardment. The comparison between mass distributions and kinetic energy spectra determined under the molecular ion Bombardment and those for the atomic ion Bombardment showed both qualitative and quantitative differences. A hypothesis about the existence of different cluster ion emission mechanisms for small clusters of several atoms and for larger ones is proposed.
Jun Chen - One of the best experts on this subject based on the ideXlab platform.
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non crystallization and enhancement of field emission of cupric oxide nanowires induced by low energy ar ion Bombardment
Applied Surface Science, 2015Co-Authors: Xiaomeng Song, Jun ChenAbstract:Abstract The effect of low energy Ar ion Bombardment on the structure and field emission properties of CuO nanowires was studied. The morphology and structure were characterized by scanning electron microscopy and high resolution transmission electron microscopy. Non-crystallization of the nanowire was found after Bombardment, which was due to the diffusion of the defects induced by knock-on ions. The work function of nanowires decreased after Bombardment which was attributed to the preferential sputtering of oxygen. Field emission measurements showed that after Bombardment with different energy the turn-on field decreased first and then increased with increasing ion energy. The lowest turn-on field was obtained with the optimal ion energy of 215 eV. The typical turn-on fields of the as-grown samples and samples after Ar ion Bombardment with energy of 215 eV were about 6.5 V/μm and 5.25 V/μm, respectively. The lowered field emission turn-on field was attributed to the increase of field enhancement factor and decrease of work function.
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cathodoluminescent properties of nanocrystalline lu3ga5o12 tb3 phosphor for field emission display applicationa
Journal of Vacuum Science & Technology. B. Nanotechnology and Microelectronics: Materials Processing Measurement and Phenomena, 2010Co-Authors: Jun Chen, S. Z. Deng, J LinAbstract:The cathodoluminescent properties of nanocrystalline Lu3Ga5O12:Tb3+ phosphor films were investigated. Phosphor films were prepared on indium tin oxide coated glass by a screen printing method. The Lu3Ga5O12:Tb3+ phosphor is mixed with In2O3 nanoparticles to improve the luminescence and degradation properties of phosphor films under electron excitation. Cathodoluminescent spectra and luminance degradation behavior of the Lu3Ga5O12:Tb3+ phosphor films under electron Bombardment were studied. Enhancement of the luminescence was observed after being mixed with In2O3 nanoparticles. Also, the In2O3 mixed Lu3Ga5O12:Tb3+ phosphor shows improvement of the resistance to the electron Bombardment. The results show that the Lu3Ga5O12:Tb3+ phosphor is stable under electron Bombardment and has potential for application in field emission display devices.
Yuji Baba - One of the best experts on this subject based on the ideXlab platform.
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emission of silicon cluster ions by molecular ion Bombardment
Applied Physics Letters, 1998Co-Authors: Hiroyuki Yamamoto, Yuji BabaAbstract:Silicon cluster ions (Sin+) with n⩽8 emitted from a Si(100) surface under Bombardment with 4 keV SF5+, SF+, F+, and Xe+ ions have been observed. It was shown that, in all cases, the relative cluster yields (Y) roughly exhibited a power-law dependence, Y(n)∝n−δ, where n is the number of atoms in the cluster ion. The exponents δ of the power law were in the order of δ(SF5+)<δ(SF+)<δ(Xe+)<δ(F+), which was the same order as that of the size of these ions. The results indicate that the size of the bombarded ions greatly affects the cluster-ion emission. For the SF5+ Bombardments, the intensity of even-n clusters (Si2+, Si4+, Si6+) was greater than that of the adjacent cluster ions with odd-n, which is in good agreement with the calculated stability of silicon cluster ions in the gas phase. It is concluded that the silicon cluster ions are effectively produced by the polyatomic SF5+ Bombardment through the formation of high-density collision cascades at the irradiated local area.
Annemie Bogaerts - One of the best experts on this subject based on the ideXlab platform.
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defect healing and enhanced nucleation of carbon nanotubes by low energy ion Bombardment
Physical Review Letters, 2013Co-Authors: Erik C Neyts, Kostya Ostrikov, Zhao Jun Han, Shailesh Kumar, A C T Van Duin, Annemie BogaertsAbstract:Structural defects inevitably appear during the nucleation event that determines the structure and properties of single-walled carbon nanotubes. By combining ion Bombardment experiments with atomistic simulations we reveal that ion Bombardment in a suitable energy range allows these defects to be healed resulting in an enhanced nucleation of the carbon nanotube cap. The enhanced growth of the nanotube cap is explained by a nonthermal ion-induced graphene network restructuring mechanism.
A Wucher - One of the best experts on this subject based on the ideXlab platform.
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kinetic energy distributions of neutral in and in2 sputtered by polyatomic ion Bombardment
Applied Surface Science, 2006Co-Authors: A V Samartsev, A WucherAbstract:Kinetic energy distributions of neutral In monomers and In2 dimers sputtered from a polycrystalline indium surface under Bombardment with 5 keV/atom Au1 � and Au2 � projectiles havebeen investigatedbymeans of laserpostionizationtime-of-flight massspectrometry. Results show that 5 keVAu1 Bombardment leads to results in full compliancewith linear cascade sputtering theory. Forpolyatomic ion Bombardment, we find a clear transition to a collisional spike dominated emission process. The spike contribution appears as a low-energy part in the sputtered flux which increases with increasing projectile nuclearity and energy. We show that, the velocity spectrum associated with the low-energy contribution is virtually identical for sputtered monomers and dimers. This finding has important implications with respect to the particle emission mechanism under polyatomic projectile Bombardment. # 2006 Elsevier B.V. All rights reserved.
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sputtering of indium using aum projectiles transition from linear cascade to spike regime
Physical Review B, 2005Co-Authors: A V Samartsev, A Duvenbeck, A WucherAbstract:We have investigated the yields and emission velocity distributions of neutral In atoms and In2 dimers sputtered from a pure indium surface under Bombardment with Aum − m=1,2 ,3 projectile ions. It is shown that 5-keV Au1 Bombardment leads to results in full compliance with linear cascade sputtering theory. All polyatomic projectiles are found to generate an additional low-energy contribution to the sputtered flux, which increases with increasing projectile nuclearity and energy and completely dominates the spectra under 10-keV Au3 Bombardment. Analysis shows that this contribution cannot be explained in terms of thermal spike sputtering models. Instead, the results indicate a spike emission mechanism, which closely resembles a free expansion of a supercritically heated subsurface volume.
