Mixed ED-MD transitions

Static-coupling model for line transitions 147 7.3.4. Mixed ED-MD transitions 168... 

This transformation is important for mixed ED-MD transitions, where both ED and MD contributions have to be summed (see eqs. 55 and 56). 

More generally, it has been noted [116] that the oscillator strengths for fully allowed ED MD EQ transitions are in the approximate ratio of 1 10 5 10 6, respectively. However, ED transitions are parity forbidden in the case of f-f intraconfigurational transitions, so that the mechanism which enables such transitions for rare earth ions is via crystal-field mixing of fN wave functions with opposite parity wave functions such as fN-1d due to the odd terms HCP = B, C, (i) with f= 1,3,5,7 (which are usually ignored when... 

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