Reciprocal vectors system parameters

The latter in turn are obtained from the inverse transformation (3.30) of those given by fej2 ( i = 1,2). Thus, (the soequilibrium positions of I and s electronic states in the coordinate system with base vectors qj,. We may restate this by saying that an electron sees the displacements during the transition sm ln in emission and the parameters A (p = l,2) in absorption ln i sm i. We shall return to this question in Section 3.2.5, where the symmetry properties of G2 are discussed. We have purposely used here a rather detailed (and therefore sometimes cumbersome) notation for the parameters Ajj and This has been done to make the discussion in the following sections all the more clear. In Chapter 8, it will often be convenient to extend this notation to higher vibrational degrees of freedom. 

---