共查询到20条相似文献,搜索用时 93 毫秒
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能量为0.6MeV/C荷能碳团簇离子Cn^ (n=2-5)注入到NaCl单晶,利用TRIM程序对碳团簇在NaCl单晶中的射程进行模拟,碳团簇NaCl单晶内存在一定长度的“团簇区域”。光学吸收谱表明:由于团簇区域的存在,不同碳离子团簇辐照产生的缺陷种类浓度都有很大不同,较大团簇会产生V2和V3色心,色心浓度也较大。 相似文献
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利用磁控溅射与液氮冷凝相结合产生金属及其化合物团簇 总被引:1,自引:0,他引:1
利用磁控溅射与液氮冷凝相结合的团簇产生设备成功地制备了多种金属及金属化合物等团簇,团簇尺寸大小为2-30nm,其微结构为晶体结构。 相似文献
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利有铯负离子溅射源和石墨阴极产生并引出了碳团簇负离子流,观察到了一些电子亲和势很小的团簇,用C60/C70混合物做阴极,也引出了C60及其碎片的负离子束,分析了碳团簇负离子束流的质谱组成特点和束流变化的一些规律。 相似文献
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讨论了由三个氘原子组成的氘团簇离子束与独立氘离子束在轰击固体靶时,在原子过程呼D-D核聚变过程中体现出的差别。对氘团簇与固体靶相互作用的机理进行了分析。 相似文献
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PANZheng-Ying WANGYue-Xia WEIQi LIZhi-Jie ZHOULiang ZHANGLiang-Kun 《核技术(英文版)》2004,15(6):321-327
This paper tries to outline the influence of atomic mobility on the initial fabrication of thin films formed by LECBD. Based on our recent studies on low-energy cluster beam deposition (LECBD) by molecular dynamics simulation, two examples, the deposition of small carbon clusters on Si and diamond surfaces and AI clusters on Ni substrate, were mainly discussed. The impact energy of the cluster ranges from 0.1 eV to 100 eV. In the former case,the mobility and the lateral migration of surface atoms, especially the recoil atoms, are enhanced with increasing the impact energy, which promote the film to be smoother and denser. For the latter case, the transverse kinetic energy of cluster atoms, caused mainly by the collision between moving cluster atoms, dominates the lateral spread of cluster atoms on the surface, which is contributive to layer-by-layer growth of thin films. Our result is consistent with the experimental observations that the film structure is strongly dependent on the impact energy. In addition, it elucidates that the atomic mobility takes a leading role in the structure characteristic of films formed by LECBD. 相似文献
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研究了Cu:CaF2复合膜的红外光吸收与金属团簇结构之间的关系。结果表明Cu金属的表面等离子体共振吸收频率明显依赖Cu团簇的大小。随着团簇尺寸的减小,共振吸收峰发生红移;吸收峰变宽。并且在吸收峰位附近表现出较大的第三级非线性系数,其不电反应速度小于150fs。 相似文献
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A machine to prepare nano grain metal-insulator films,for example Cu:CaF2 film,by meams of magnetron sputtering generating clusters and at the same time evaporating insulator medium,is introduced.This machine is sutable for almost all solied metal and semiconductor clusters.And with it,many kinds of function fiml series can be prepared.The size of cluster embedded in insulator is from 10 to 70nm,The Cu cluster and medium CaF2 are both polycrystalline structure. 相似文献
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YANG Chen ZHANG Bin WANG Jianzhong SHI Liqun CHENG Huansheng YANG Tieying WEN Wen HU Fengchun Applied Ion Beam Physics Laboratory 《核技术(英文版)》2012,(2):65-69
ZnO films, doped with 2.9 atom% Cu, were prepared by radio frequency magnetron sputtering on sapphire substrate at different substrate temperatures. No magnetic impurities such as Fe, Co and Ni were found in the PIXE spectra. The ZnO:Cu films possessed the wurtzite ZnO structure. No precipitates such as CuO and Cu2O or Cu cluster, were observed by synchrotron radiation X-ray diffraction in the ZnO:Cu films. Extended X-ray absorption fine structure (EXAFS) analysis showed that Cu atoms were incorporated into ZnO crystal lattice by occupying the sites of Zn atoms. 相似文献
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对He、Ti原子比n(He)/n(Ti)为0.004~0.300的7块氚化钛膜样品在1300K以下进行热解吸分析,以获得它们的热解吸谱。在低于1300K范围内,氚化钛膜共有4种氦的热释放峰,分别对应于贯穿至表面的氦泡、近表面的氦、体相中的氦泡和氦的小团簇。对这4种类型的氦释放峰的解吸温度和解吸量随膜中总氦量的变化分别进行分析,研究观测膜中各种状态存在的氦量随n(He)/n(Ti)增加的变化趋势。实验观测到,升温将导致氚化钛膜可容纳的氦量大幅降低。 相似文献
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用射频磁控溅射技术在蓝宝石衬底上制备了一组不同衬底温度的Mn掺杂ZnO薄膜。质子激发X射线荧光(PIXE)测量表明,薄膜中仅有含量为5 at.%的Mn,未见其它磁性杂质元素(如Fe、Co、Ni等)。同步辐射X射线衍射(SR-XRD)表明,这些Mn掺杂ZnO薄膜具有纤锌矿ZnO结构。SR-XRD和扩展X射线吸收精细结构谱(EXAFS)分析显示,薄膜中未发现Mn团簇或MnO、MnO2、Mn2O3、Mn3O4等二次相,Mn原子是通过替代Zn原子而进入了ZnO晶格。 相似文献
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M.K. Sharma Matthias Voelskow Ratnamala Chatterjee 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(10):1631-1636
We report thermal annealing and 100 MeV Si8+ swift heavy ion irradiation effects on the structural and magnetic properties of Ni-implanted HfO2 thin films. At low Ni doping concentration (∼1%), HfO2 thin films show ferromagnetic behavior. We clearly demonstrate the cluster free nature of our film using cross-sectional high resolution transmission microscopy and magnetization vs. temperature data. Rutherford backscattering spectrometry is used to estimate the film thickness and to establish that Ni-ions are placed in the HfO2 matrix. By comparing the results for the annealed and swift heavy ion irradiated samples, it is concluded that the enhancement in magnetic signal is closely related to the dispersion/diffusion of implanted Ni and defect creation such as oxygen vacancies. The results of magnetic force microscopy supported the observation of room temperature ferromagnetism in Ni-implanted HfO2 films. 相似文献