When did the person that helped van Vleck develop CFT die?
Crystal field theory Crystal Field Theory (CFT) is a model that describes the breaking of degeneracies of electron orbital states, usually d or f orbitals, due to a static electric field produced by a surrounding charge distribution (anion neighbors). This theory has been used to describe various spectroscopies of transition metal coordination complexes, in particular optical spectra (colors). CFT successfully accounts for some magnetic properties, colours, hydration enthalpies, and spinel structures of transition metal complexes, but it does not attempt to describe bonding. CFT was developed by physicists Hans Bethe and John Hasbrouck van Vleck in the 1930s. CFT was subsequently combined with molecular orbital theory to form the more realistic and complex ligand field theory (LFT), which delivers insight into the process of chemical bonding in transition metal complexes.
Vladimir Pentkovski Vladimir Mstislavovich Pentkovski (Russian: Владимир Мстиславович Пентковский; March 18, 1946, Moscow, Soviet Union – December 24, 2012, Folsom, California, United States) was a Russian-American computer scientist, a graduate of the Moscow Institute of Physics and Technology, Ph. D., Doctor of Science, distinguished professor, winner of the highest former Soviet Union's USSR State Prize (1987), one of the leading architects of the Soviet Elbrus supercomputers and the high-level programming language El-76. At the beginning of 1990s, he immigrated to United States where he worked at Intel and led the team that developed the architecture for the Pentium III processor. According to a popular legend Pentium processors are named after Vladimir Pentkovski.