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The electron energy-loss function of graphite is studied for momentumtransfers q beyond the first Brillouin zone. We find that near Braggreflections the spectra can change drastically for very small variations in q.The effect is investigated by means of first principle calculations in therandom phase approximation and confirmed by inelastic x-ray scatteringmeasurements of the dynamic structure factor S(q,\omega). We demonstrate thatthis effect is governed by crystal local field effects and the stacking ofgraphite. It is traced back to a strong coupling between excitations at smalland large momentum transfers.

Anomalous Angular Dependence of the Dynamic Structure Factor near Bragg Reflections: Graphite