Fig. 1: Schematic of APT and atomic behaviours.
From: Quantifying short-range order using atom probe tomography
a, 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 algorithm29,31. Millions (~106–109) of atoms from the analysed specimen can be reconstructed into tomographic atom maps47. The primacy of the issues of ionic trajectory and detector efficiency on the spatial resolution of the tomographic reconstruction is apparent. b, Two-dimensional schematic of anti-clustering, random and clustering SRO behaviours (refer to the purple atom pairs within first NN).
