SYNCHROTRON-RADIATION PHOTOEMISSION-STUDY OF SUPPORTED MESOSCOPIC MANGANESE PARTICLES

We present a photoemission study using synchrotron radiation of suppor ted mesoscopic Mn particles deposited in situ from a gas aggregation s ource producing clusters with a size distribution peaking at 2.5 nm. B oth, dilute assemblies of particles adsorbed on HOPG surfaces and nano -scale granular Mn-V films produced by co-depositing vanadium from an electron beam source and manganese clusters from the gas-aggregation s ource have been studied. Exposed manganese particles on graphite show a significant change in the lineshape of the 3s photoemission features relative to the bulk which is interpreted as an enhanced atomic magne tic moment. An increased asymmetry of the 3p line is ascribed to a les s efficient screening of the core hole and is consistent with the tren d observed previously in islanded Mn films. Incorporating manganese pa rticles into a vanadium film induces a multiplet structure in the vana dium 3s core level suggesting that the manganese magnetically polarise s surrounding vanadium atoms. Copyright (C) 1996 Elsevier Science Ltd