共查询到20条相似文献,搜索用时 15 毫秒
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Valery KuzminPeter Sigmund 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(9):817-823
A computer code has been developed to explore reciprocity, i.e. the equivalence of electronic stopping cross sections for the ion-target pair A in B with that for B in A in the regime around and below the Bohr speed. With the aim of establishing reciprocity as a tool for identifying reliable experimental data and interpolating between them, we have studied stopping cross sections involving carbon, aluminium and gold either as projectile ions or as target materials. The case of carbon - where numerous data are available - is used to illustrate in detail various options to establish a body of credible data. Aluminium and gold serve to illustrate the case where these elements mostly are found as target materials in available data. 相似文献
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Hidetoshi Kimura Wataru Takeuchi 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(17):2817-2822
The dependence of the electronic stopping powers on the incident ions of the atomic number Z1 in the materials of carbon, aluminum, nickel, silver and gold has been evaluated by using the new Firsov formula included the Sugiyama potential for the Firsov model and the screening length with the shell effect of electrons. It was found that the calculated results based on the new Firsov formula show the experimentally well-known Z1-oscillation in the electronic stopping powers. The electronic stopping powers measured in carbon, aluminum, nickel and silver are reasonably reproduced by the new Firsov formula for the ZBL potential. 相似文献
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Z.G. Wang A. Dunlop Z.M. Zhao Y. Song Y.F. Jin C.H. Zhang Y.M. Sun J. Liu 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2005,230(1-4):262-268
In the present work, 120 keV N-ion doped and 30 MeV C60 ion irradiated graphite-like-carbon samples were characterized by RBS, micro-FTIR, micro-Raman, XPS spectroscopy and the variation of the properties of the samples with the N-dopant and/or C60 irradiation fluence have been studied. The RBS spectra showed that C60 irradiation can induce a partial diffusion of N atoms to the surface and the amount of the diffused N atoms increases slightly with increasing C60 irradiation fluence. The FTIR and Raman spectra exhibit characteristic bands of carbon nitrogen bonds showing that the C and N atoms are chemically bonded. The amount of chemically bonded C and N atoms increases with increasing N-dopant. By deconvolution of the XPS spectra, the atomic concentration of N and C atoms were obtained and it was identified that the samples mainly consist of three phases, namely, C3N4, CNx and tetrahedral amorphous carbon. The effect of N-dopant and C60 irradiation fluence on the modification of the properties of the samples is also discussed. 相似文献
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Federico Bosia Silvia Calusi Stefano Lagomarsino Mirko Massi Federico Picollo Silvio Sciortino Maurizio Vannoni 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(19):2991-2995
We present experimental results and numerical finite element analysis to describe surface swelling due to the creation of buried graphite-like inclusions in diamond substrates subjected to MeV ion implantation. Numerical predictions are compared to experimental data for MeV proton and helium implantations, performed with scanning ion microbeams. Swelling values are measured with white-light interferometric profilometry in both cases. Simulations are based on a model which accounts for the through-the-thickness variation of mechanical parameters in the material, as a function of ion type, fluence and energy. Surface deformation profiles and internal stress distributions are analyzed and numerical results are seen to adequately fit experimental data. Results allow us to draw conclusions on structural damage mechanisms in diamond for different MeV ion implantations. 相似文献
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《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(20):2340-2344
This paper reports on the fabrication and characterization of a high purity monocrystalline diamond detector with buried electrodes realized by the selective damage induced by a focused 6 MeV carbon ion beam scanned over a pattern defined at the micrometric scale. A suitable variable-thickness mask was deposited on the diamond surface in order to modulate the penetration depth of the ions and to shallow the damage profile toward the surface. After the irradiation, the sample was annealed at high temperature in order to promote the conversion to the graphitic phase of the end-of range regions which experienced an ion-induced damage exceeding the damage threshold, while recovering the sub-threshold damaged regions to the highly resistive diamond phase. This process provided conductive graphitic electrodes embedded in the insulating diamond matrix; the presence of the variable-thickness mask made the terminations of the channels emerging at the diamond surface and available to be connected to an external electronic circuit. In order to evaluate the quality of this novel microfabrication procedure based on direct ion writing, we performed frontal Ion Beam Induced Charge (IBIC) measurements by raster scanning focused MeV ion beams onto the diamond surface. Charge collection efficiency (CCE) maps were measured at different bias voltages. The interpretation of such maps was based on the Shockley-Ramo-Gunn formalism. 相似文献
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The results of optical absorption analysis of the synthetic diamonds(type Ib) which were implanted with 40 keV molecular hydrogen ions at doses of 10^15-10^17H/cm^2(at 100K),showed that the increase of optical density(OD) of modified layer(-140nm) in UV-VIS region was dependent upon the damage level caused by ion implantation process.The range of relative optical band gap(Er.opt) around 2.0eV suggested that an amorphous carbon network structure like a-C film,which probably contains some localized subtetrabedral-coordinated clusters embedded in the fourflod(sp^3) sites.was tentatively found in this layer,basing on the optical gap of carbon materials.The evolution of Er,opt with ion fluence indicated that no more hydrogenated carbon compositions were produced in as -implanted samples,while the increase of Er,opt with annealing temperature was very similar to that of hydrogen content dependence of Eopt in hydrogenately amorphous carbon(a-C:H):In addition the optical inhomogeneity of type Ib diamond has been revealed by a 2-dimension topograph in transmission mode at λ=430nm。 相似文献
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keV量级的N+注入引起的氨基酸分子损伤 总被引:2,自引:0,他引:2
利用电子顺磁共振和红外光谱研究了keV级N^+注入到几种固态氨基酸样品中引起的分子结构损伤。结果表明,这一注入导致了分子的严重损伤:分子结构解体,红外吸收普遍降低;产生了大量的碎片,其中自由基碎片的类型和数量随注入离子的剂量发生显著变化;损伤碎片重组,形成了新的化学组合,表现出新的红外吸收峰。 相似文献
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I.O. Usov D. Koleske K.E. Sickafus 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(17):2962-2964
We present a method of ion implantation doping of GaN, which permits reduced residual damage. The method consists of performing implantation in several steps with annealing between each step. Residual damage was analyzed by RBS/channeling and compared to a traditional implantation and annealing procedure. Better lattice recovery is clearly achieved using the alternating implantation and annealing approach. We attribute the efficient recovery to smaller damage amounts introduced during each implantation step, as well as to suppression of secondary defect formation. 相似文献
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以金刚石薄膜为掩膜,采用低能Ar+室温倾角溅射的方法制备密度和形貌可控的硅纳米圆锥阵列.扫描电子显微镜(SEM)结果表明,离子束溅射后得到的硅纳米圆锥密度与作为掩膜的金刚石薄膜颗粒密度相当;硅纳米圆锥的形貌与离子束入射角有密切关系,随着入射倾角由30°增大到75°;得到的硅纳米圆锥的锥角由73°减小到23°,其长径比从500 am/360 nm增大到2400nm/600nm.由于金刚石比硅材料的溅射速率更低,因此以金刚石薄膜为掩膜可以制备较大长径比的硅纳米圆锥阵列;随着入射角的增大,离子束溅射诱导的表面原子有效扩散系数减小和溅射速率增大是硅纳米圆锥的锥角减小、长径比增大的主要原因. 相似文献
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M. Bianconi G.G. Bentini M. Chiarini P. De Nicola G.B. Montanari A. Menin A. Nubile S. Sugliani 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(22):3452-3457
A simulation tool has been developed to engineer the damage formation in Lithium Niobate by ion irradiation with any atomic number and energy. Both nuclear and electronic processes were considered and, in particular, the dependence on the ion velocity of the electronic excitation damage efficiency has been taken into account. By using this tool it is possible both to draw damage nomograms, useful to qualitatively foresee the result of a given process, and to perform reliable simulations of the defect depth profiles, as demonstrated by the good agreement with the experimental data available in the literature. 相似文献
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G. Mattei C. Maurizio C. de Julin Fernndez P. Mazzoldi G. Battaglin P. Canton E. Cattaruzza C. Scian 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2006,250(1-2):206-209
In this work we present in situ investigations on the increase of the hcp-to-fcc transition temperature for Co with respect to the bulk value (420 °C) when nanoclusters are considered. Starting from Co:SiO2 composites obtained by ion implantation with average Co cluster size of about 5 nm, a transition temperature between 800 °C and 900 °C is found upon thermal annealing in vacuum by in situ transmission electron microscopy. Preliminary results on electron irradiation to promote the transition at lower temperatures are presented. 相似文献
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Cu离子和Al离子注入M2钢表面改性研究 总被引:9,自引:0,他引:9
报道了M2型高速工具钢在Cu,Al离子注入后表面硬度及抗磨损性的变化。对注入样品进行了显微硬度及抗磨损性的测量和XRD与RBS分析,观察了表面强化与离子注入条件之间的关系。结果显示,注入样品与未注入样品相比,表面硬度及抗磨损性均有显著提高。分析结果表明,Cu,Al离子注入后样品中产生了不同的相,它们对表面强化所起的作用不同。 相似文献
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研究了<0001<和<1210>晶向蓝宝石(α-Al2O3单晶)在注入360keV.1×10 ̄16cm ̄-2或100keV、6×10 ̄16cm ̄-2的In ̄+后产生的损伤、注入层的性能变化和退火行为。实验结果表明,退火过程中损伤的恢复和In的分布与退火气氛有关:在100keV、6×10 ̄16cm ̄-2的In ̄+注入时,注入层电阻率降低了10个量级,大小为6.8×10 ̄3·cm,表面损伤层的显微硬度提高了92%;在360keV,1×10 ̄16cm ̄-2的In+注入时,其表面损伤层的显微硬度提高了45%,在空气中不同温度下退火后,其显微硬度的变化和损伤的变化具有相同的规律。 相似文献