Single-molecule magnets (SMM) exhibiting slow magnetic relaxation have attracted increasing interest, both from a fundamental point of view, and for the potential practical applications in data storage and processing. The newly synthesized 4f-based molecules are promising systems for increasing the anisotropy barrier in SMM. However, multiple relaxation processes are observed in several 4-f and 5-f ion based complexes, indicating a complex relaxation dynamics. The nature and the origin of these processes are still unclear. Herein we propose to use the MERLIN time of flight spectrometer to perform direct measurements of the energy level scheme of a dysprosium complex to obtain a comprehensive picture of the relaxation dynamics.