title: Visualization of single heavy atoms by dark field electron microscopy.
abstract: Dark field electronmicrographs of atoms of palladium, iodine, platinum, osmium, and uranium in model compounds have been obtained. Statistical analyses and a series of blind tests demonstrate the validity of the results. Moreover, optical density measurements of the images indicate that the observed relative scattering cross-sections of these atoms agree well with the theoretical cross-sections calculated from a Thomas-Fermi-Dirac model of the atom.
mesh_terms: D001435:Bacteriophages; D001483:Base Sequence; D001665:Binding Sites; D004269:DNA, Bacterial; D007455:Iodine; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D009711:Nucleotides / Q000032:analysis*; D009992:Osmium; D010165:Palladium; D010984:Platinum; D013941:Thymine; D014501:Uranium
chemical_list: D004269:DNA, Bacterial; D009711:Nucleotides; D009992:Osmium; D010984:Platinum; D014501:Uranium; D010165:Palladium; D007455:Iodine; D013941:Thymine