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单词 Wigner-Eckart theorem
释义 Wigner-Eckart theorem
[`wig·nǝr `ek·ǝrt ´thir·ǝm]
QUANTUM MECHANICS
A theorem in the quantum theory of angular momentum which states that the matrix elements of a tensor operator can be factored into two quantities, the first of which is a vector-coupling coefficient, and the second of which contains the information about the physical properties of the particular states and operator, and is completely independent of the magnetic quantum numbers.
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