Search for outer-well states above the ionization potential in H-2

Recent ab initio calculations by Detmer et al. [J. Chem. Phys. 109 (1998) 9694] and by Staszewska and Wolniewicz [J. Mol. Spectr. 212 (2002) 208] have produced potential energy curves in the energy region between the n = 3 and n = 4 dissociation limits in hydrogen, that in principle support bound states of an exotic nature. They are confined to large internuclear separation (R > 10 a.u.) by a potential barrier giving the H