Example Application of Analysis Quadrupole Effects

Since 103Rh has 7=1/2 and both isotopes of Ir have 7 = 3/2, we might have expected each g-component to be a quartet of doublets. The Rh coupling is barely visible on the high-field features, but there is no trace on the other two g-components indeed, the low-field and mid-field components are more like 1 2 1 triplets than the expected 1 1 1 1 quartet. 

We must first examine the predicted spacing of the expected quartet. The outer and inner spacings are given by  

Assuming that the quadrupole matrix axes differ from the g-matrix axes by a = 45°, F3 and F4 simplify to  

Under these circumstances, the inner and outer quartet spacings are  

One more item needs to be discussed in reference to this spectrum. Why did it turn out that a = 45° Consider the coordination geometry of the Ir atom (1). 

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