SO and NCI in their a 1A states

The pure microwave rotational spectrum of NCI in its a1A state has been studied by Kobayashi, Goto, Yamamoto and Saito [154] at frequencies up to 400 GHz. Extensive hyperfrne structure from both 14N and 35 Cl was observed and the following unusual coupling scheme was found to be the most appropriate  

The effective Hamiltonian contained terms for both nuclei describing the orbital hy-perfine interaction, the electric quadrupole interaction and the nuclear spin-rotation interaction  

The matrix elements of each term have been calculated in various different parts of this book. First, for the orbital hyperfine terms  

the electric quadrupole matrix elements for two equivalent nuclei were given in chapter 8 when we discussed the magnetic resonance spectrum of D2. When the nuclei are not identical the results, for A diagonal, are 

For the remaining reduced matrix elements involving the nuclear spins in (10.105) we have 

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