513.001 Molecular and Solid State Physics

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Cesium Iodine

Cesium Iodine (CsI) has a simple cubic Bravais lattice with a Cs atom at position 000 and an Iodine atom at ½½½.

a) Determine the Madelung constant for CsI including only the nearest neighbors and the next nearest neighbors in the sum.

b) Which figure below is the phonon dispersion curve for CsI? Explain your reasoning.