Ralph Kronig: diferenças entre revisões

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|nacionalidade ={{USAb}} [[Estados Unidos|Estadunidense]]

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'''Ralph de Laer Kronig''' ([[Dresden]], [[10 de março]] de [[1904]] — [[Zeist]], [[16 de novembro]] de [[1995]]) foi um [[Física|físico]] [[Alemanha|teuto]]-[[Estados Unidos|estadunidense]].

 

He is noted for the discovery of particle [[spin (physics)|spin]] and for his theory of [[X-ray absorption fine structure|x-ray absorption spectroscopy]]. His theories include the [[Kronig-Penney model]], the [[Coster-Kronig transition]] and the [[Kramers–Kronig relation]].

 

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Any satisfactory theory of dispersion must comply with the condition that the scattered wave can never appear in advance of the incident wave that produces it. Physicists [[Hendrik Anthony Kramers]] of The Netherlands and Ralph de Laer Kronig of Germany showed that this basic causality condition implies that the dispersion (i.e., the variation of refractive index with frequency) and the absorption are not independent. They derived equations enabling the absorption to be calculated when the dispersion is known (for all frequencies) and vice versa. It is not surprising that a relationship should exist, because dispersion and absorption are each related to the resonators described above in connection with scattering by bound electrons. The relationship has been found of great importance in many branches of pure and applied physics.

 

==Livros==

{{Caixa de sucessão

|título=[[Medalha Max Planck]]

|antes=[[Eugene Paul Wigner]]

|depois=[[Rudolf Peierls]]

 

{{DEFAULTSORT:Kronig, Ralph}}

[[Categoria:Físicos da Alemanha]]