Characterization of rotational eigenstates

In order to understand the subsequent discussion it is helpful first to elucidate the eigenvalue spectrum of the triatomic compound [see also Nesbitt (1988a,b)]. The body-fixed theory for total angular momenta / 0 outlined in Section 11.1, especially the set of coupled equations 

Zeroth-order energies and wavefunctions may be obtained by neglecting the coupling between different j- and different 17-states and solving the 

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