نتایج جستجو برای: transition metal atoms
تعداد نتایج: 486890 فیلتر نتایج به سال:
Metal clusters serve as model systems to study basic problems of electronic correlation. Vacuum ultraviolet light from the free-electron laser FLASH ionizes 5d electrons from mass-separated negatively charged clusters, thus transiently leading to core-ionized neutral systems. Shielding of the core hole affects the electron binding energy. From the strong deviation from expectations of the metal...
Since this discovery, a number of studies have looked at improving the catalytic effects and understanding the role of additives in H2 cycling. However, the mechanism by which NaAlH4 is activated in the presence of a small amount of a transition metal is still not well understood. One of the principle questions is “How do the Al atoms migrate the long distances required during the hydrogenation...
We demonstrate the rational design of nanoporous two-dimensional supramolecular structures by the hierarchical assembly of organic molecules and transition metal atoms at surfaces. Single-molecule level observations with scanning tunneling microscopy monitor the successive aufbau of structures with increasing complexity. From the primary components secondary mononuclear chiral complexes are for...
Our investigations reveal that the bonding of the transition-metal atoms on a single-wall carbon nanotube ~SWCN! depends on the detailed contact conditions. On the basis of our results, we suggest that the early 3-d elements ~Sc, Ti, and V! can be expected to be good candidates for making metal–SWCN contacts of low resistance, while contacts employing the late 3-d elements ~Fe, Co, and Ni! and ...
Submitted to the NANOTUBE'04 Conference: Molecular dynamics study of catalytic ability of transition metals in nucleation process of SWNTs Yasushi Shibuta and Shigeo Maruyama Dept. of Mech. Eng. The University of Tokyo Contact e-mail: [email protected] Interaction between catalytic metals and carbon atoms on formation process of SWNTs are studied by the home-made multi-body potenti...
A surprising magnetic behavior of 3d transition-metal monolayers on the (100) tungsten surface has been reported recently [Ferriani et al., 2005]. The tendency to ferromagnetic (V, Cr, Mn) vs. antiferromagnetic (Fe, Co) order in these layers differs significantly from the situation on many other substrates, e.g. on W(110), Cu(100) or Pd(100). The aim of our work is to explore further the proper...
We report Extended X-Ray Absorption Fine Structure measurements at the Mn K absorption edge on hole doped manganese oxides La1ÿxCaxMnO3 in a wide temperature range above and below the metal±insulator transition temperature in presence of a magnetic field. In accordance with previous studies an anomalous increase in the Debye-Waller factors is detected at the phase transition in the first coordi...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید