THE most direct way by which an ion can be displaced in an ionic lattice when the lattice is subjected to ionizing radiation is through simple collision displacements. Thus high-energy electrons ...

The study of lattice sums began when early investigators wanted to go from mechanical properties of crystals to the properties of the atoms and ions from which they were built (the literature of ...

Nevertheless, rapid advances are being made, suggesting that optical lattice clocks will soon be challenging the performance of the best trapped-ion optical clocks. Which system is finally ...