A theory is presented for the fine and hyperfine interactions in the (2)Pi
state open shell complexes like NO-HF containing remote magnetic nuclei. Th
e nitrogen hyperfine Hamiltonian is based on the conventional Frosch and Fo
ley treatment for diatomic radicals. An alternative treatment has been deve
loped for the intermolecular hydrogen and fluorine magnetic hyperfine inter
actions based on a dipolar model for both electron spin and orbital magneti
c moments. (C) 2001 American Institute of Physics.