Microwave spectra of ground state Ne-20:(HBr)-H-1-Br-79, Ne-20:(HBr)-H-1-Br-81, Ne-22:(HBr)-H-1-Br-79, Ne-22:(HBr)-H-1-Br-81, and their corresponding deuterated isotoporners are obtained using pulsed-nozzle Fourier Transform microwave spectroscopy. The Ne-20:(HBr)-H-1-Br-79 ground state . = 0.09025(11) is characteristic of a nearly free rotor. The available Ne-20:(HBr)-H-1-Br-79, Ne-20:(HBr)-H-2-Br-79, Ne-22:(HBr)-H-1-Br-79 and Ne-22:(HBr)-H-2-Br-79 data are analyzed and used to determine an initial ground vibrational state morphed potential for the dimer. This resulting intermolecular potential indicates a global minimum Ne:BrH linear isomeric structure with R-cm 3.42 Angstrom. These analyses also provide structural perspectives. on the prototypical homologous series Rg:HX (Rg = Ne, Ar, Kr; X = F, Cl, Br, I). (C) 2004 Published by Elsevier B.V.