Abstract
In the framework of a real quantum mechanical problem, we investigate the modified unit cell concept in order to calculate the crystal field effects in periodic systems. We make use of a recently proposed procedure based on the cancellation of the unit cell low order electric moments. Applied to a one-dimensional periodic chain of lithium hydride molecules, this procedure compares in an excellent way with the recently developed multipole expansion technique and offers a dramatic improvement of the results with respect to the usual cluster-type approaches.
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