I know that for atoms and molecules the electronic transition must obey the selection rule. Now is that the case for solids. i will be grateful if anyone introduce any references.
The short answer is yes. Please consult any good textbook on group theory (such as that by V Heine, or JF Cornwell, Vol. I) and the discussions surrounding the theory of group representations, irreducible representations, perturbations, and the Wigner-Eckart theorem.