We propose to conduct inelastic neutron scattering measurements on a deuterated polycrystalline sample of the {Fe9} molecule [(Fe9-3-O)4 (O3PPh)3(O2CCMe3)13] to determine its low-lying magnetic excitations and their dependence on temperature and applied magnetic field using the OSIRIS spectrometer. In each molecule, Fe3+ ions (spins s = 5/2) occupy nine of the twelve sites of an icosahedron; the remaining 3 sites are occupied by non-magnetic phosphorous atoms. This magnetic cluster is of importance as a prototype of a magnetic nano-switch. That expectation is supported by theoretical calculations showing the icosahedron cluster (the hypothetical, not-yet-synthesized {Fe12}) undergoes a first order metamagneitc transition with the associated hysteretic behavior [1]. Magnetic susceptibility measurements are insufficient for verifying the validity of a model Hamiltonian