Direct Identification Of The Minority And Majority Species In The Single-Molecule Magnet Mn-12-Acetate By Inelastic Neutron Scattering

A field-dependent inelastic neutron scattering (INS) experiment on an array of oriented single crystals of Mn-12-acetate is reported. The experimental results provide clear evidence that the minority species observed in the INS spectra is the fast-relaxing species observed in, for instance, AC-susceptibility measurements.