共查询到19条相似文献,搜索用时 46 毫秒
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采用弹性反冲分析法同时测量薄膜中氢和氘的深度分布 总被引:1,自引:0,他引:1
给出由重叠反冲能谱计算氢和氘的浓度及深度分布的解谱技术,用4.5MeV和4.2MeV的α粒子作入射粒子得到两个反冲能谱。在考虑和不考虑能量展宽效应的情况下分析了钛膜中氢和氘的深度分布;发现考虑能量展宽效应的影响得到的氢和氘的深度分布是令人满意的。 相似文献
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文章介绍了用1.7MV小串列加速器提供的4—7MeV多电荷C离子,采用弹性反冲法(ERD)分析了α-Si:H中氢元素的深度分布。计算表明,近表面处的深度分辨率为15-30nm,可探测深度100—700nm。探讨了入射能量和散射几何条件的优化问题。比较了几种分析方法的测量结果。 相似文献
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本文介绍了一种弹性反冲探测分析冲质子谱模拟的计算方法。用这种方法对40keV质子注入硅中和非晶硅薄膜中氢浓度的深度分布进行了研究,并取得了良好的结果。 相似文献
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反冲靶中子探测系统DT灵敏度的实验研究 总被引:1,自引:0,他引:1
设计了实验标定用PIN-反冲质子靶室探测系统,利用加速器中子源对探测系统的DT中子灵敏度进行了实验研究,并与理论计算结果进行了比较,一致性较好.实验结果检验和验证了理论计算程序,可以为同种类型探测系统的参数设计提供实验依据. 相似文献
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Elastic recoil detection (ERD) proposed for the analysis of light elements in a heavier matrix is an appropriate method for its specialities. Optimization of experimental parameters in ERD such as scattering geometry and incident beam energy is very important when using a small accelerator with energy lower than 10 MeV. In this paper a computer program ERDAl is developed for the purpose, and is proved to be useful for practical handling of ERD experiments. 相似文献
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H. Timmers T. D. M. Weijers R. G. Elliman 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2002,190(1-4):393-396
Specific aspects of heavy ion elastic recoil detection (ERD) with gas ionization detectors have been studied using representative measurements. A particular strength of the technique is the detection and direct quantification of elements with atomic numbers in the range Z=2–8, which are often not accessible with other ion beam techniques. Within the wider spectrum of analytical techniques in materials science, heavy ion ERD has unique capabilities, when the particular problem requires in addition the analysis of heavy elements or hydrogen detection. Whenever only heavy element analysis or only hydrogen profiling is of interest, alternative techniques tend to be superior. 相似文献
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ELASTIC RECOIL DETECTION ANALYSIS OF LIGHT ELEMENTS IN THIN FILMS USING 35 MeV~(35) Cl~(6+) BEAM 总被引:1,自引:0,他引:1
In this paper, an elastic recoil detection analysis method is described using 35 MeV ~(35)Cl as incident ions. This method can determine and profile simultaneously H, D, He, C and O or in the other case, H, C, N and O. The depth resolution for the elements heavier than He is better than 20 nm. It has been applied to study the Co/Si and TiN thin films, and the depth profiles of He implanted in monocrystal silicon. 相似文献
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H. Timmers T. D. M. Weijers R. G. Elliman J. Uribasterra H. J. Whitlow E. -L. Sarwe 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2002,190(1-4):428-432
Measurements of the stoichiometry of silicon nitride films as a function of the number of incident ions using heavy ion elastic recoil detection (ERD) show that beam-induced nitrogen depletion depends on the projectile species, the beam energy, and the initial stoichiometry. A threshold stoichiometry exists in the range 1.3>N/Si1, below which the films are stable against nitrogen depletion. Above this threshold, depletion is essentially linear with incident fluence. The depletion rate correlates non-linearly with the electronic energy loss of the projectile ion in the film. Sufficiently long exposure of nitrogen-rich films renders the mechanism, which prevents depletion of nitrogen-poor films, ineffective. Compromising depth-resolution, nitrogen depletion from SiN films during ERD analysis can be reduced significantly by using projectile beams with low atomic numbers. 相似文献
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Yanwen Zhang Mikael Elfman Thomas Winzell Harry J. Whitlow 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1999,150(1-4):548-553
Thin (10 nm–1 μm) films of ferromagnetic material constitute an important class of materials that are difficult to analyse by conventional ion beam analytical (IBA) techniques because they are based on the ferromagnetic elements (Co, Fe, Mn, Ni, and Cr). The similar or overlapping isotope masses makes it difficult to separate the elemental signals using time of flight and energy dispersive elastic recoil detection (ToF-E ERD). In this exploratory study we have investigated the use of Particle Induced X-ray Emission (PIXE) measurements to refine the mass dispersive depth profile information from ToF-E ERD. The surfaces of two commercial magnetic media were investigated. One sample was a double density diskette with a coating of ferrite particles in an organic binder. The other sample was a complex C/Co/Cr/Ni–P/Al multilayer structure taken from a standard hard disc. The Lund nuclear microprobe with a 2.55 MeV proton beam was used for PIXE analysis. ToF-ERD measurements were carried out using a 55 MeV 127I10+ ion beam incident at 67.5° to the surface normal. The time of flight and kinetic energy of recoils ejected at 45° to the ion beam direction was measured in a detector telescope. The findings demonstrate that by detailed analysis of the PIXE spectra it is possible to remove the ambiguities in mass assignment of the ToF-ERD data associated with the ferromagnetic elements. 相似文献
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Kei MitsuharaTaishi Matsuda Hideki OkumuraAnton Visikovskiy Yoshiaki Kido 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(16):1859-1864
Oxygen deficiency and excess of rutile titania (TiO2) surfaces are important factors for catalytic activities of metal nano-particles on the TiO2 supports. Medium energy ion scattering (MEIS; 80 keV He+) coupled with elastic recoil detection analysis (ERD; 150 keV Ne+) can determine the numbers of bridging O (Obr) vacancies (VO) and excess O atoms adsorbed on the 5-fold Ti rows of TiO2(1 1 0) surfaces. The amounts of VO and adsorbed O were derived by H2O and 18O2 exposure followed by ERD and MEIS analyses, respectively. The present analysis revealed that only about a half of VO are filled and a comparable amount of O atoms are adsorbed on the reduced TiO2(1 1 0) surface after exposure to O2 (1000 L; 1 L = 1 × 10−6 Torr s) at room temperature (RT). We also detected the adsorbed O for the hydroxylated TiO2(1 1 0) after 18O2 exposure at RT. Finally, it is shown that the O adsorbed on the Ti rows reacts with CO probably to form CO2 at RT. Based on the results obtained here, we clarify the reason why only a half of VO are filled by exposing reduced surface to O2 at RT and what is the primary source of subsurface excess electronic charge, which acts as a leading part of the surface electrochemistry and gives the defect state in the band gap seen in the valence band spectra for reduced and hydroxylated TiO2(1 1 0) surfaces. 相似文献
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R. Pretorius
D. Bezuidenhout
《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1990,50(1-4):105-108The thicknesses of optical coatings vary between a few hundred Å and a few μm. Ion-beam techniques are ideally suited for probing this thickness range and in this work we discuss the use of Rutherford backscattering spectrometry (RBS) and elastic recoil detection analysis (ERDA) for characterizing optical coatings such as ZnS, YF3,Y2O3, C and Ge on silicon and germanium substrates. A general evaluation of the favourable features as well as the limitations of RBS and ERDA ion beam analysis for characterizing optical coatings is given. 相似文献
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J.M. Sisterson 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2008,266(18):3913-3918
The recoil losses of product nuclei in proton-induced reactions at 200 and 500 MeV in Al, Si, Mg and Fe targets were measured using carbon catcher foils or stacks of Mylar foils. In all cases, the recoil losses were less than 1% for the target thicknesses used and so in the ongoing systematic study to measure cross sections for proton- and neutron-induced reactions, these losses are not important. For Fe targets irradiated at 200 MeV, the recoil losses in the forward direction for several product nuclei measured in both a carbon catcher foil and a Mylar stack were in good agreement. From the recoil losses, the mean forward recoil ranges for several product nuclei were calculated. 相似文献