Racah coefficient

Racah coefficient

[′rä·kä ‚kō·i′fish·ənt]
(quantum mechanics)
A coefficient that appears in the transformation between the modes of coupling eigenfunctions of three angular momenta; they differ only by, at most, a sign from the six-j coefficients. Also known as W coefficient.
References in periodicals archive ?
The reduced matrix element of such a scalar product can be put in the form of a product of a Racah coefficient and two reduced matrix elements that depend on the first and the second electron, respectively [10, see p.
The knowledge of CGC, Racah coefficients (6j symbols) and 9j symbols is essential for understanding the corresponding quantum physical problem since all matrix elements of the physical quantities are proportional to them (see [36, 37]).
SMIRNOV, Clebsch-Gordon and Racah coefficients for [U.