Definition of Racah in English:


Pronunciation /ˈrakɑː/


Physics Chemistry
  • Used attributive with reference to Racah's work in quantum mechanics; specifically "Racah coefficient" noun either of two coefficients representing electrostatic interactions within a system of equivalent charged particles, especially electrons within an atom; "Racah parameter" noun = "Racah coefficient".


1950s; earliest use found in The Physical Review. From the name of Giulio Racah, Italian-born Israeli physicist, whose work on spectra gave rise to the coefficients.