Ab initio 2 Ab initio calculations 2 Ammonia 2 Ammonia clusters 2 Ammonia molecules 2 Charge separation (CS) 2 Electron transfer process (ETP) 2 Excited states 2 Free radical reactions 2 Ground state 2 Hydrogen 2 Ionic strength 2 Phenols 2 Pump probes 2 Small clusters 2 Structure calculations Time scaling 2