mean inner potential
mean inner potential
When the Coulomb potential at point r from an atom is summed for all the constituent atoms, the total potential is written as V(r). V(r) possesses the crystal lattice periodicity, thus allowing V(r) to be expanded in the Fourier series with the lattice vector. The "mean inner potential" is defined as the zeroth-order term V0 in the Fourier expansion. V0 gives the (average) refractive index of the crystal and normally ranges between 10 and 20 V. The expansion coefficient of each order (Fourier potential) is calculated from the corresponding crystal structure factor.
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