[Wien] question about optical transitions in the solid

[abdel Mar..]

Dear Wien2k users

i have a question about selection rule, in optical transitions 
a selection rule, or transition rule, formally constrains the possible transitions 
of a system from one state to another  delta l= +- 1. 

it's OK only for transitions in the same atom or in all the solid? so 
if i have a oxide (MO2  for example)  it's physically correct to say:
 i have  transitions between O(p) states and M(f) states in spite
 of non respecting the selection rule  delta l <>+-1?

thanks
 		 	   		  
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