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The principle and method for gas-solid interface study via low-energy pulsed electron beams are introduced, and the processes of adsorption-desorption and displacement are experimentally investigated. The desorption yields, threshold energies, and cross sections for N2 and O2 from polycrystalline Ni and W in vacuum (1×10-3Pa) at (T=300K) are measured. At the end of the paper, the conclusions are given.

By using the tight-binding molecular dynamics (TBMD) method, the structures and energies of the medium-sized silicon clusters (Si11—Si32) have been simulated, and the radial distribution function and bond-angle distribution for different size of clusters have been described in this paper. The structural transform from prolate to near-spherical configurations has been observed at the cluster size n=27 in silicon clusters.