Inelastic gamma-ray scattering: tool to validate quantum mechanical potential energies

Inelastic gamma-ray scattering (Compton scattering) is a distinguished tool to explore the electronic and magnetic response of various substances and is also an emphatic technique to validate the quantum mechanical exchange and correlation potentials used in the DFT calculations. Charge and magnetic Compton profiles are used to deduce the electron/spin momentum densities in functional materials like dichalcogenides, ferrites, ferroelectrics, chromates, Heusler alloys, oxides, etc. In the present invited talk, besides salient features of basic principle, I will highlight about Compton profiles of dosimetric Mg, Ti doped LiF, Zr substituted lead titanate, Sn-Se based thermo electrics, and tantalum chalcogenides, etc. Temperature dependency of spin moments using magnetic Compton profiles of Fe doped CoCr₂O₄ system will also be discussed. (author)