State-to-state photodetachment in the negative hydrogen ion

In this final report of a 3-year LDRD project on the fundamental physics of the negative hydrogen ion, new physical phenomena were observed, including the first direct excitation (i.e. without intermediate resonances) of a multiphoton electron detachment resonance in an atomic ion, and the first excess photon detachment of an electron from an atomic species in competition with a single photon process. These new phenomena are relevant to modeling and theory discrimination in 3-body quantum mechanics.