1/f-noise in metallic clusters

When the cluster excitation energy is such that the hopping between different isomers becomes energetically allowed, the power spectrum corresponding to the very long-time dynamics is dominated by the 1/f-noise. The emergence of 1/f-noise is indicative of the absence of any characteristic time scales in the structure/conformation cluster dynamics. The 1/f-noise portion of the power spectrum covers all frequencies below the characteristic cluster modes and is essentially temperature independent once the cluster has ''melted''.