共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
3.
4.
5.
6.
7.
《Surface science》1986,172(3):L568-L570
Smith, Padmore and Norris have claimed that the first three monolayers of Fe grown at room temperature on Ag(100) form a strained fcc γ-Fe layer for which the mismatch to the substrate is 11%. We point out a simple error in their calculations of mismatch, and suggest instead that such growth produces a bcc α-Fe(100) film, for which the mismatch to the substrate is only 0.8%. 相似文献
8.
THz波段位于微波与红外之间 ,该波段电磁波与物质的相互作用是一个崭新的研究领域 .应用THz时域光谱技术研究了两种重要的单晶基片材料 (1 0 0 )MgO和 (1 0 0 )LaAlO3的THz光谱 .在 0 2— 2THz频率范围 ,得到这两种材料在THz波段的光学参数 .结果表明 ,在THz波段MgO基片材料的折射率 n和介电系数 ε不随频率的变化而变化 ,而LaAlO3基片材料的折射率和介电系数随着频率的增加而略有增加 .在 1THz频率处 ,测得MgO的复折射率 n =3 4 6 i0 0 0 1 ,复介电系数 ε =1 2 2 7 i0 0 6 ;LaAlO3的复折射率 n =4 78 i0 0 2 ,复介电系数 ε =2 2 5 i0 2 在THz波段 ,LaAlO3基片的介电损耗tanδ约为MgO的 5倍 ,且两者的介电损耗值均小于 0 0 1 ,说明MgO和LaAlO3材料作为高温超导器件基片材料可以工作于THz波段 相似文献
9.
10.
11.
12.
《Journal of Electron Spectroscopy and Related Phenomena》1987,44(1):163-174
High resolution electron energy loss Spectroscopy (HREELS), X-ray photoelectron Spectroscopy (XPS) and low energy electron diffraction (LEED) have been used to characterize initial stages of oxidation of Si(100)2x1 and Gex Si1−x (100)2x1 surfaces. Different oxidation stages of Si were identified by measuring Si 2p core level shifts and characteristic vibrations of Si-O-Si complexes. The latter may be described in the framework of continuous random network models.Then,from the experimentally determined frequencies, force constants,average bond angles and bond lengths are determined. Complementary,marker experiments with atomic hydrogen as a probe in conjunction with HREELS were used to determine the local, atomic structure for different stages of oxidation from chemical shifts of Si-H and Ge-H stretching mode intensities, respectively. 相似文献
13.
14.
随着国内超导磁体应用的发展,迫切需要摆脱使用蓄电池供电的状况。根据国外报道和具体工作需要,我们选用比较简单的电源形式,试制了一台0—100A的强磁场电源。本电源稳定度小于7×10~(-4)/10分钟;用微电机自动加流,加流速度可根据需要调节;电流可以预先设定;对于磁体失超有保护装置。 相似文献
15.
Gustafson J Lundgren E Mikkelsen A Borg M Klikovits J Schmid M Varga P Andersen JN 《J Phys Condens Matter》2012,24(22):225006
The O adsorption on Rh(100) has been studied using high resolution core level spectroscopy, low energy electron diffraction and scanning tunnelling microscopy. In addition to the well known (2 × 2), (2 × 2)-pg and c(8 × 2) structures at coverages of 0.25, 0.5 and 1.75 ML respectively, an intermediate (3 × 1) structure with a coverage of 2/3 ML is identified. 相似文献
16.
《Surface science》1986,171(1):L432-L440
Chemisorption of carbon monoxide on Cu(100)-c(2 × 2)Pd was investigated using ultraviolet photoelectron spectroscopy. Adsorption was found to occur molecularly with a saturation coverage at 100 K which is approximately the same as that on Cu(100). Desorption spectra indicate that the CO-surface bond strength for the majority of the molecules is intermediate to that for the pure metals. The 4σ satellite, characteristic of photoemission from CO on Cu, was not observed. 相似文献
17.
18.
用能带理论研究了Cu(111)、Cu(110)和Cu(100)表面的振动弛豫。结果表明,第一内层间距为2.073±0.008(收缩0.53%±0.008)[对Cu(111)],1.25±0.01(收缩2.2%±0.01[对Cu(110)],1.815±0.001(膨胀0.55%±0.001)[对Cu(100)];而第二内层间距为2.15±0.01(膨胀2.2%±0.01[对Cu(111)],1.32±0.01(膨胀3.6%±0.01)[对Cu(110)],2.084±0.001(膨胀15.5%±0.001)[对Cu(100)];而第三内层间距为2.24±0.01(膨胀7.3%±0.01时Cu(111)]。 相似文献
19.
The Cu(100) surface covered with atomic nitrogen has been studied with low energy electron diffraction (LEED), Auger electron spectroscopy (AES) and inelastic electron scattering (EELS). Atomic nitrogen, formed by thermal dissociation of NH3 adsorbed at 100 K, forms a c(2×2) overlayer on the Cu(100) surface. The dispersion of adsorbate and substrate associated modes of the Cu(100) surface covered with a c(2×2) nitrogen overlayer has been measured along the two dimensional Brillouin zone in the
- by inelastic electron scattering. The experimental data are compared to a lattice dynamical slab calculation. The Rayleigh-mode (S4-phonon) is only slightly changed by the N-overlayer. An optimum fit for the perpendicular and parallel nitrogen modes (=320 cm–1 and =740 cm–1 at =0.1) is obtained when the nitrogen atom is placed 0.6 Å above the first copper layer. 相似文献
20.
ZHANGH ZHANGP.X ZHANGG.Y YUL G.Cristiani H.U.Habermeier 《光散射学报》2005,17(1):87-89
In this paper, we briefly report the property difference of La_(1-x)Sr_xMnO_3 (x=0.1) ultra-thin films (~([001]) orientation) at different thickness grown on SrTiO_3 (100) substrate.It is found that the magnetic interaction is greatly enhanced when film t… 相似文献