The electron–electron interaction, electron–nucleus interaction as well as the orbit–orbit, orbit–spin, spin–spin couplings, and the other complicate interactions of electrons in free ions have been discussed in Chap. 1.
CITATION STYLE
Luo, Z., & Huang, Y. (2020). Group Theory and Quantum Theory. In Springer Series in Materials Science (Vol. 289, pp. 31–67). Springer. https://doi.org/10.1007/978-981-32-9668-8_2
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