MADELUNG CONSTANT
Definition
A <MADELUNG CONSTANT> is a <NUMBER(math)> that has a <Property> that is, for a univalent ionic crystal of specified structure, the binding <ENERGY> V_b per pair of ions is V_b = alpha.e^2/(4pi.epsilon_0.a) where e is A <ELEMENTARY CHARGE>, epsilon_0 is the electric constant and a is a lattice constant which should be specified