Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Impact-driven effects in thin-film growth: steering and transient mobility at the Ag(110) surface  [PDF]
Michele Ceriotti,Riccardo Ferrando,Francesco Montalenti
Physics , 2008, DOI: 10.1088/0957-4484/17/14/033
Abstract: Low-energy atomic impacts on the Ag(110) surface are investigated by molecular dynamics simulations based on reliable many-body semiempirical potentials. Trajectory deflections (steering) caused by the atom-surface interaction are observed, together with impact-following, transient-mobility effects. Such processes are quantitatively analysed and their dependence on the initial kinetic energy and on the impinging direction is discussed. A clear influence of the surface anisotropy on both steering and transient mobility effects is revealed by our simulations for the simple isolated-atom case and in the submonolayer-growth regime. For the latter case, we illustrate how steering and transient mobility affect the film morphology at the nanoscale.
Structure of self-organized Fe clusters grown on Au(111) analyzed by Grazing Incidence X-Ray Diffraction  [PDF]
H. Bulou,F. Scheurer,P. Ohresser,A. Barbier,S. Stanescu,C. Quiros
Physics , 2003, DOI: 10.1103/PhysRevB.69.155413
Abstract: We report a detailed investigation of the first stages of the growth of self-organized Fe clusters on the reconstructed Au(111) surface by grazing incidence X-ray diffraction. Below one monolayer coverage, the Fe clusters are in "local epitaxy" whereas the subsequent layers adopt first a strained fcc lattice and then a partly relaxed bcc(110) phase in a Kurdjumov-Sachs epitaxial relationship. The structural evolution is discussed in relation with the magnetic properties of the Fe clusters.
A New Direct Process to Prepare YBa2Cu3O7-? films on Biaxially Textured Ag{110}<211>  [PDF]
Rongping Wang,Yueliang Zhou,Shaohua Pan,Meng He,Zhenghao Chen,Guozhen Yang
Physics , 1999, DOI: 10.1016/S0921-4534(99)00487-6
Abstract: YBCO films were successfully prepared on biaxially textured Ag{110}<211> substrates by using pulsed laser deposition. X-ray diffraction results showed that the degree of preferential orientation of Ag{110}<211> substrates varied with increasing annealing temperature. With a thin template layer deposited at low temperature, YBCO film with c-axis orientation and in-plane biaxial alignment could be obtained at high deposition temperature. Scanning electron microscopy observation revealed that YBCO grains enlarged but Ag grains on the surface of the YBCO films became smaller with increasing deposition temperature. At optimal deposition conditions, Ag atoms diffuse into the YBCO grain boundaries, and then fill in the weak-link regions in the YBCO film, resulting in the conduction easier. Jc value of 5?105A/cm2 was obtained at 77K and zero magnetic field for the best YBCO film in our work.
hcoo在cu(110)、ag(110)和au(110)表面的吸附  [PDF]
物理化学学报 , 2009,
Abstract: 采用密度泛函理论(dft)以及广义梯度近似方法(gga)计算了甲酸根(hcoo)在cu(110)、ag(110)和au(110)表面的吸附.计算结果表明,短桥位是最稳定的吸附位置,计算的几何参数与以前的实验和计算结果吻合.吸附热顺序为cu(110)(-116kj·mol-1)>ag(110)(-57kj·mol-1)>au(110)(-27kj·mol-1),与实验上甲酸根的分解温度相一致.电子态密度分析表明,吸附热顺序可以用吸附分子与金属d-带之间的pauli排斥来关联,即排斥作用越大,吸附越弱.另外还从计算的吸附热数据以及实验上hcoo的分解温度估算了反应co2+1/2h2→hcoo的活化能,其大小顺序为au(110)>ag(110)>cu(110).
In situ investigation of structural properties during formation of pentacene thin film on Ag(110)with MBE-LEED

Wang Ye-Liang,Shi Dong-Xi,Ji Wei,Du Shi-Xuan,Guo Hai-Ming,Liu Hong-Wen,Gao Hong-Jun,
,时东霞,季 威,杜世萱,郭海明,刘虹雯,高鸿钧

物理学报 , 2004,
Abstract: The structural transition of pentacene thin films on single Ag (110) crystals has been directly observed using a home-designed in situ low-energy electron diffraction during the course of absorption and subsequently changes of substrate temperature.The pentacene moleculs showed the evolution from disordered structure in the submonolayer region to a well-ordered structure in the monolayer on the substrate at room temperature.The experimental and theoretical results showed that the molecules lay flat on the Ag (110) surface with two domain orientations mirrored with respect to the crystal axis of the silver substrate.Furthermore, the ordered structures can keep stable when the substrate temperature is below the sublimation temperature of pentacene.
Electron reflectivity measurements of Ag adatom concentrations on W(110)  [PDF]
J. de la Figuera,N. C. Bartelt,K. F. McCarty
Physics , 2006, DOI: 10.1016/j.susc.2006.02.069
Abstract: The density of two-dimensional Ag adatom gases on W(110) is determined by monitoring local electron reflectivity using low energy electron microscopy (LEEM). This method of adatom concentration measurement can detect changes in adatom density at least as small as 10$^{-3}$ ML for a $\mu$m size region of the surface. Using this technique at high temperatures, we measure the sublimation rates of Ag adatoms on W(110). At lower temperatures, where Ag adatoms condense into monolayer islands, we determine the temperature dependence of the density of adatoms coexisting with this condensed phase and compare it with previous estimates.


物理学报 , 1960,
Abstract: The gamma-rays, cmitted in the decay of Ag110m have been studied by use of gamma-spectro-meter and gamma-gamma coincidence techniques Fourteen gamma-rays have been found with energies of 448, 620, 656, 679, 705, 741, 764,817, 884, 936, 1384, 1473, 1504 and 1560 kw. All those gamma-rays can be fitted into seven excited levels in Cd110 of energies 656 kev, 1473 kev, 1540 kev, 2160 kev, 2219 kev, 2476 kev and 2924 kev respectively. The generally accepted cascade relationship between gamma-rays has been verified. Furthermore, coincidence measurements have pointed out that the 1560 kev gamma-ray is emitted during the transition between 2219 kev level and 656 kcv level, that the 817 kev gamma-ray belongs to transition beween 1473 kev level and 656 kev level, and that the 764 kev gamma-ray should proceed the 1504 kev gamma-ray. A modified decay schcml has been proposed.
Atomic exchange mean field study of intermixing of Au on Ag(110)  [PDF]
J. A. Nieminen
Physics , 1995, DOI: 10.1016/0039-6028(95)01006-8
Abstract: A mean field method to study heteroepitaxial thin film growth is applied to growth, intermixing and surface reconstructions of $Au$ on $Ag(110)$. The results are in accordance with experimentally observed ``burrowing'' at submonolayer coverages and growth of elongated, $(1 \times 3)$ reconstructed, $Au$ clusters at higher coverages. At coverages of few monolayers the surface between the clusters has a high concentration of $Ag$, and ordered rows of $Au$ are formed just beneath the surface.
Adsorption behavior of iron phthalocyanine on a Ag(110) surface

Wu Ke,Huang Qi-Huan,Zhang Han-Jie,Liao Qing,He Pi-Mo,

中国物理 B , 2012,
Abstract: An investigation on the growth behavior of FePc on a Ag (110) surface is carried out by using scanning tunneling microscopy (STM). At an FePc coverage of 3.5 ML, an ordered superstructure (densely packed) with a lateral shift is observed. The densely packed superstructure can be attributed to the substrate commensuration and the intermolecular van der Waals attractive interaction. The in-plane lateral shift in the superphase is specifically along the direction of 110] azimuth. The results provide a new perspective to understanding the intermolecular and the molecule-substrate interactions.
Structure and Quantum Well States in Silicene Nanoribbons on Ag(110)  [PDF]
Baojie Feng,Hui Li,Sheng Meng,Lan Chen,Kehui Wu
Physics , 2015,
Abstract: We have performed scanning tunneling microscopy/spectroscopy (STM/STS) study and first-principles calculations to investigate the atomic structure and electronic properties of silicon nanoribbons (SiNRs) grown on Ag(110). Despite of the extensive research on SiNRs in the last decades, its atomic structure is still not fully understood so far. In this report we determine that the structure of SiNRs/Ag(110) is armchair silicene nanoribbon with reconstructed edges. Meanwhile, pronounced quantum well states (QWS) in SiNRs were observed and their energy spectrum was systematically measured. The QWS are due to the confinement of quasiparticles perpendicular to the nanoribbon and can be well explained by the theory of one-dimensional (1D) 'particle-in-a-box' model in quantum mechanics.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.