Racahn.

Brit.

/ˈrakɑː/, U.S.

/ˈrækɑ/

Origin: From a proper name. Etymon: proper name Racah.

Etymology: < the name of Giulio Racah (1909–65), Italian-born Israeli physicist, whose work on spectra gave rise to the coefficients ( Physical Rev. (1942) 61 186–97, 62 438–62).

Physics and Chemistry.

Used attributively with reference to Racah's work in quantum mechanics; spec. Racah coefficient n. either of two coefficients representing electrostatic interactions within a system of equivalent charged particles, esp. electrons within an atom; Racah parameter n. = Racah coefficient n.

ΘΚΠ

the world > matter > physics > atomic physics > particle physics > particle avoiding strong interaction > electron > [noun] > co-efficient of interaction

Racah coefficient1952

1949 Proc. Physical Soc. A. 62 765 In the present calculations it was found most convenient to use the formula of Racah, to whose paper..the reader is referred.]

1952 Physical Rev. 88 581/2 The coefficients of the transformation have been given by Racah..in terms of his W function and are called the Racah coefficients.

1962 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. xxvi. 595 The Racah parameters are measures of the energy separations of the various Russell–Saunders states of an atom.

1975 Physics 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.

1983 Jrnl. Math. Physics 24 1968 Strict application of Racah algebra gives an efficient way of deriving the tensorial form of the hyperfine interaction one-electron operator involved in NMR spin coupling effects.

1994 Jrnl. Physics B 27 1913 The present work allows Bessel function approximations to be obtained for both Clebsch-Gordan and Racah coefficients.

2003 Jrnl. Non-crystalline Solids 319 95 The ligand splitting energy and Racah parameter B vary between ~38000 and 40000 cm⁻¹ and between ~435 and 650 cm⁻¹, respectively.

This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022).

单词	racah
释义	Racahn. Brit. /ˈrakɑː/, U.S. /ˈrækɑ/ Origin: From a proper name. Etymon: proper name Racah. Etymology: < the name of Giulio Racah (1909–65), Italian-born Israeli physicist, whose work on spectra gave rise to the coefficients ( Physical Rev. (1942) 61 186–97, 62 438–62). Physics and Chemistry. Used attributively with reference to Racah's work in quantum mechanics; spec. Racah coefficient n. either of two coefficients representing electrostatic interactions within a system of equivalent charged particles, esp. electrons within an atom; Racah parameter n. = Racah coefficient n. ΘΚΠ the world > matter > physics > atomic physics > particle physics > particle avoiding strong interaction > electron > [noun] > co-efficient of interaction Racah coefficient1952 1949 Proc. Physical Soc. A. 62 765 In the present calculations it was found most convenient to use the formula of Racah, to whose paper..the reader is referred.] 1952 Physical Rev. 88 581/2 The coefficients of the transformation have been given by Racah..in terms of his W function and are called the Racah coefficients. 1962 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. xxvi. 595 The Racah parameters are measures of the energy separations of the various Russell–Saunders states of an atom. 1975 Physics 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. 1983 Jrnl. Math. Physics 24 1968 Strict application of Racah algebra gives an efficient way of deriving the tensorial form of the hyperfine interaction one-electron operator involved in NMR spin coupling effects. 1994 Jrnl. Physics B 27 1913 The present work allows Bessel function approximations to be obtained for both Clebsch-Gordan and Racah coefficients. 2003 Jrnl. Non-crystalline Solids 319 95 The ligand splitting energy and Racah parameter B vary between ~38000 and 40000 cm⁻¹ and between ~435 and 650 cm⁻¹, respectively. This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022). < n.1952
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