Production of Fe clusters by collisions of metal vapour with supersonic argon beams
University of Leicester, Department of Physics and
Astronomy, University Road, Leicester, LE1
a e-mail: email@example.com
Received in final form: 17 January 2013
Published online: 30 April 2013
The growth of Fe clusters by collisions of Fe atoms with Ar atoms flowing in a supersonic beam was investigated by Fe mass flux measurements and transmission electron (TEM) microscopy. Moderate Ar densities of the order of 1 × 1020 m-3 were sufficient to cause cluster growth which was attributed to the low temperature of the Ar beam. TEM imaging of deposited clusters revealed diameter distributions from 2 to 10 nm depending on the deposition time. Extrapolation to zero deposition time revealed a cluster size of 2.4 nm grown in the gas phase. Growth on the surface was attributed to diffusion of single Fe atoms which are co-deposited with the clusters in the process and which agglomerate when they hit a cluster.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013