| 释义 |
Racah Physics and Chem.|ˈrækɑː|
The name of Giulio Racah (1909–65), Italian-born Israeli physicist, used attrib. with reference to his work in quantum mechanics, as Racah coefficient or parameter, either of two coefficients representing electrostatic interactions within a system of equivalent charged particles, esp. electrons within an atom.
1952Physical Rev. LXXXVIII. 581/2 The coefficients of the transformation have been given by Racah..in terms of his W function and are called the Racah coefficients. 1959Astrophysical Jrnl. CXXIX. 441 By means of a few simple formulae, all multiplet strengths..can be expressed in terms of only two basic quantities, viz., the Racah coefficients and the coefficients of fractional parentage. 1962Cotton & Wilkinson Adv. Inorg. Chem. xxvi. 595 The Racah parameters are measures of the energy separations of the various Russell-Saunders states of an atom. 1966Phillips & Williams Inorg. Chem. II. xxiii. 162 The total electron-electron repulsion energy of each LS state arising from a dn configuration can be calculated and expressed in terms of so-called Racah parameters. 1968A. B. P. Lever Inorg. Electronic Spectroscopy vii. 207 The Racah inter⁓electronic parameter B (and to a lesser extent C) is a function of ligand, central ion and stereochemistry. 1975Physics Bull. Apr. 169/3 The classification of particle and nuclear properties uses techniques such as spinors and Racah algebra which are not for the first degree student. |