共查询到20条相似文献,搜索用时 93 毫秒
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用扫描隧道显微镜(STM)对Cu(111)-Au和Cu(111)-Pd表面的局域功函数进行了研究.通过 测量隧道电流对针尖样品间距的响应,得到了与STM形貌图一一对应的表面局域功函数图像. 实验发现,Au/Pd覆盖层和Cu衬底间的功函数有明显的不同.Pd薄膜的功函数甚至超过了其体 本征值,且功函数在台阶处变小.用偶极子的形成解释了台阶处功函数的降低.这一工作表明 ,用测量局域功函数的方法容易区分表面上不同的元素,并具有纳米尺度的空间分辨率.
关键词:
扫描隧道显微镜
局域功函数
台阶 相似文献
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用扫描隧道显微镜在Cu(111)-Au和Pt(111)-Ag表面上对局域功函数进行了测量.在扫描的同时通过测量隧道电流对针尖样品间距离变化的响应,可以在得到扫描隧道显微镜(STM)图的同时得到功函数图.用这种方法,成功地观察到Au,Ag覆盖层与Cu,Pt衬底间的功函数的差别.结果表明:Au覆盖层的功函数介于Cu(111)和Au(111)的功函数之间,这与其它方法的结果一致.在Pt(111)-Ag表面观察到了局域功函数随覆盖层厚度的变化.本工作表明:扫描隧道显微镜在研究功函数与表面结构的关系方面是十分有用的;用测量局域功函数的方法还可以区分表面不同种的物质
关键词: 相似文献
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将激光扫描共聚焦显微镜与实验力学中的云纹法相结合,提出了激光扫描共聚焦显微镜云纹法并对其进行了实验研究.实验中以激光扫描共聚焦显微镜的扫描线作为虚拟参考栅,以1 200 lines/mm的全息光栅作为试件栅,这两组栅线相干涉形成云纹条纹.对激光扫描共聚焦显微镜中云纹的形成原理和出现条件进行了讨论,对实验结果与理论分析进行了比较.结果表明,激光扫描共聚焦显微镜云纹法是真实可行的.由于该方法无需干涉系统且对测量环境无特殊要求,因此有望在待测物体表面微米量级变形观察和测量上得到应用. 相似文献
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We have demonstrated a surface plasmon polariton mediated optical Moiré effect by inserting a silver slab between two subwavelength gratings. Enhancement of the evanescent fields by the surface plasmon excitations on the silver slab leads to a remarkable contrast improvement in the Moiré fringes from two subwavelength gratings. Numerical calculations, which agree very well with the experimental observation of evanescent-wave Moiré fringes, elucidate the crucial role of the surface plasmon polaritons. The near-field Moiré effect has potential applications to extend the existing Moiré techniques to subwavelength characterization of nanostructures. 相似文献
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在物体变形场的测量中,云纹干涉的载频调制技术有重要作用.在云纹干涉中,对称光照明产生的衍射光沿试件栅表面的法线传播并产生干涉.通过改变照明光的入射角度,可实现变形条纹场的空间调制.通过光程差的分析说明了载波条纹产生的机理,得出了载波频率与照明光入射角度变化之间的关系式.利用三点弯曲加载结合二维载频调制实验,给出了实验结果.证明了在初始条纹较少的情况下,载频调制技术能有效地测量物体的位移场. 相似文献
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G. R. Drmeyan A. O. Aboyan A. A. Movcicyan 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2013,7(6):1056-1059
The results of investigations of deformation fields in the dual-use unit of a silicon triple-crystal X-ray interferometer under constant magnetic field by means of Moiré X-ray-diffraction patterns are presented. Structural distortions are found in nonpolar silicon semiconductor crystals. It is shown that a magnetic field causes a change in the period of the Moiré patterns obtained using the X-ray interferometer; the Moiré patterns disappear at a certain value of the magnetic field strength. 相似文献
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《Optics Communications》2002,201(1-3):5-9
In this letter, based on the proposed concept of Moiré sampled Bragg grating (SBG), the equivalent chirp rates of various Fourier orders in a sampled Bragg grating with chirp in the sampling period (CSP) is demonstrated for the first time via a simple novel experimental method using phase mask rotation and dual exposure technique. Difference between experimental data and calculated results is less than 9%. 相似文献
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ZHU RongHua XIE HuiMin ZHU JianGuo LI YanJie CHE ZhiGang ZOU ShiKun 《中国科学:物理学 力学 天文学(英文版)》2014,57(4):716-722
In this paper,a new method combining focused ion beam(FIB)and scanning electron microscope(SEM)Moirétechnique for the measurement of residual stress at micro scale is proposed.The FIB is employed to introduce stress relief like the macro ring-core method and fabricate gratings with a frequency of 5000 lines/mm on the measured area of the sample surface.Three groups of gratings in different radial directions are manufactured in order to form a micro-scale strain rosette.After milling ring-core by FIB,the deformation incurred by relief of the stress will be recorded with the strain rosette.The displacement/strain field can be measured using SEM scanning Moiréwith random phase-shifting algorithm.In this study,the Nickel alloy GH4169 sample(which was processed by laser shock peening)is selected as a study object to determine its residual stress.The results showed that the components of the in-plane principal stresses were-359 MPa and-207 MPa,respectively,which show good agreement with the results obtained from the available literature. 相似文献
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About ScienceDirect 《Optics Communications》1974,10(4):378-383
Experimental results show that the Moiré pattern with incoherent illumination should be explained by the spatial frequency components lower than the original one without referring to the cut-off frequency of the observation system. The general Moiré pattern is interpreted by the use of a communication theory approach. The results of this interpretation agree with Oster's indicial equation. 相似文献