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By using first principles calculations, it is found that the noble metal atoms Ag, Au and Cu would like to occupy the vacancy sites of the W(001) or Mo(001) surface to form the substitutional surface alloys, despite the fact that they do not like to form alloy in the bulk. The electronic local function (ELF) for these substitutional surface alloys shows that there is no obvious chemical bonding between...
A direct observation of surface morphology characterization of the crystals of d-alanine, d-valine and l-valine at molecular scale was presented by atomic force microscopy (AFM). The crystal structures of d-alanine, l-alanine and l-valine have been determined by X-ray diffraction methods. d- and l-alanine crystallize in the orthorhombic space group P2 1 2 1 2 1 , Z=4 with the...
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