Hello, can the dipole moment in a non periodic system be used somehow to derive a notion on the behavior in k-space for the same system? Alternatively, is there an analogue to the k-space properties for a periodic system for a non-periodic system?
If the medium is not periodic I do not see that it has a well defined k vector, unless the wave comes from the outside.
Thanks Juan, yes, this is expected from a perturbation or an electromagnetic impulse. In this case, can the dipole/quadrupole moments be related to k-vectors?
There are ceratain lattice vibrations which are polarizable, lead a net dipole moment. but this is not at all
that clear in a disordered solid. Phonons are mainly a prediction for ordered solids. So it is questionable if the outside perturbation can be given a continuity inside the solid...perhaps for long wave lengths, where you dont see local structure that well?
Thanks Juan. The structure observed , or the changes, would be at the level of the orbitals, and how they are perturbed and polarized.
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