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Electronic States in Crystals,rons. Selection rules associated with various electronic processes are also discussed. Finally, Frenkel excitons in molecular crystals are considered, which present another interesting application of the space group representations.

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Tapan K. Majumdar,Danny R. Howardian will have certain transformation properties. These symmetry considerations are facilitated by explicit use of the concepts of groups and representations. In addition, group theory is powerful in discussing energy level splitting due to perturbation and in deriving various selection rules.

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Edith G. McGeer,Patrick L. McGeerrons. Selection rules associated with various electronic processes are also discussed. Finally, Frenkel excitons in molecular crystals are considered, which present another interesting application of the space group representations.

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Gustavo Alves Andrade dos Santos and tensor representations of the unitary group is essential in understanding the wavefunctions of a many-electron atom with a definite magnitude of spin .. We have also seen that the concepts of symmetric and antisymmetric product representations play important roles in other fields covered in this book.

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