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Jacques Danon

Jacques Abulafia Danon, Brazilian physical chemist (Santos, São Paulo State 23 August 1924 – Paris 30 October 1989)
From Sephardic Jewish heritage 
Recognized all over the world as one of the founders of Mossbauer chemical and solid state spectroscopy
International authority on Mossbauer effect
Authored about 160 papers and 6 books


Clarified important aspects of the chemistry of iron compounds and of metallic iron
Established a link between the hyperfine parameters measured by Mossbauer spectroscopy and the bonding between the atoms in a solid or a molecule (1963-6)
Nuclear isomer shift and convalency in iron complexes. J. Chem. Phys. 39:236-7, 1963
Electronic structure of transition metal complex which nitrosyl ligand Mossbauer investigation. J. Chem. Phys. 41:3374-84, 1964

Developed a formalism describing the electronic structure of transition impurities in simple, noble and transition metals

With X.A. da Silva & A.A. Gomes. Phys. Rev. B4 1161 & 1168, 1971
With J.M. Knudsen discovered an iron nickel alloy which can only be produced in high energy particle accelerators

Performed important discoveries in magnetic microorganisms

Discovered magnetotactic algae

With H. G.P. Lins de Barros, D.M.S. Esquivel & L.P.H. de Oliveira. Magnetotactic algae. An. Acad. Bras. Ciencias 54:258-9, 1982

Other important results

With D.M.S. Esquivel, H.G.P. Lins de Barros, M. Farina & P.H.A. Aragão. Microorganismes magnetotactiques de la region de Rio de Janeiro. Biol. Cell. 47:227-34, 1983

With M. Farina, H.G.P. Lins de Barros & D.M.S. Esquivel. Electron microscopy and ultrastructure of a magnetotactic microorganism. Biol. Cell. 48:85-8, 1983    
Improved many laboratory techniques
Indicated new procedures for dating objects and minerals (e.g. thermo luminescence)
authored An Introduction to Mossbauer spectroscopy  


Chairman, II Panel on Applications of the Mossbauer effect its Science and Technology, Atomic Energy International Agency, Vienna (1974)
Chairman, Spring School about Mossbauer Spectroscopy, Hurfeld, Germany (1975)
Danonite Mattievich, Amorim, Amaral Jr., Torres-Tapia & Domínguez 1997 (Synthetic mixed valence iron arsenate)