Hartree Fock Slater method for materials science : the DV X [Alpha] method for design and characterization of materials ; with 33 tables Molecular orbital calculations for materials design such as alloys ceramics and coordination compounds are now possible for experimentalists. Molecuar orbital calculations for the interpretation of chemical effect of spectra are also possible for experimentalists. The most suitable molecular orbital calculation method for these purpose is the DV Xa method which is robust in such a way that the calculation converges to a result even if the structure of the molecule or solid is impossible&nbsp;in the pressure and temperature ranges on earth. This book specially addresses the methods to design novel materials and to predict the spectrallline shape of unknown materials using the DV Xa molecular orbital method but is also useful for those who want to calculate electronic structures of materials using any kinds of method. TOC:1. DV X alpha method and molecular structure. 2. Alloy design based on DV X alpha cluster method. 3. Chemical bonding around lattice imperfections in 3D transition metal compounds. 4. Application of the DV X alpha calculation to investigation of oxide ceramics. 5. Magnetic properties. 6. Optical materials. 7. Heavy elements. 8. Rediative transition. 9. Response to the creation of a core hole in transition metal compounds. 10. Determining electronic structure from Auger spectra in cluster approximation