Electron diffraction study of the rms displacements of the atoms in free clusters of krypton

Eremenko, V. V.; Kovalenko, S. I.; Solnyshkin, D. D.
April 2003
Low Temperature Physics;Apr2003, Vol. 29 Issue 4, p353
Academic Journal
The size dependence of the rms amplitude 〈u[SUP2]〉[SUP½] of the atoms in free clusters of krypton is determined for the first time, by an electron diffraction technique. The mean size &Nmacr; of the clusters formed in supersonic jets of krypton varied from 1 × 10[SUP3] to 2 × 10[SUP4] atoms/cluster. It is found that 〈u[SUP2]〉[SUP½] increases with decreasing cluster size. A comparison of the dependence observed in experiment with that calculated with allowance for the fractional contribution of surface atoms shows that for clusters with &Nmacr;⩾4 × 10[SUP3] atoms/cluster the increase of 〈u[SUP2]〉[SUP½] with decreasing &Nmacr; is due solely to the growth of the relative number of surface atoms. The correlation between the calculation and experiment vanishes when &Nmacr;⩽4 × 10[SUP3] atoms/cluster. In that case the experimental values are considerably higher than the calculated value, a circumstance which indicates that in small aggregations there are other factors besides the surface which contribute to the growth of 〈u[SUP2]〉[SUP½].


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