Chemical Structure from Scientific Research

APT where the ionization of atoms under a standing field result in their field evaporation towards a detector. Time-of-flight measurements precisely indicate the mass-to-charge ratio, revealing the chemical identity of each individual evaporated ion. A position-sensitive detector enables a tomographic reconstruction atomic layer by atomic layer using a reverse-projection algorithm 29 , 31 . Millions (~10 6 10 9 ) of atoms from the analysed specimen can be reconstructed into tomographic atom maps 47 . The primacy of the issues of ionic trajectory and detector efficiency on the spatial resolution of the tomographic reconstruction is apparent.

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