Efficient sympathetic motional-ground-state cooling of a molecular ion
experiment. We optimize the cooling rate of ground state cooling schemes for single 25 Mg + ions and sympathetic ground state cooling of 24 MgH + . In particular, we show that robust cooling is achieved by combining pulsed Raman sideband cooling with continuous quench cooling. Furthermore, we experimentally demonstrate an efficient strategy for ground state cooling outside the Lamb-Dicke regime.