The elastic scattering on jellium clusters |
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Authors: | B. Wassermann W. Ekardt |
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Affiliation: | 1. Fu Berlin, Fachbereich Physik, Arnimallee 14, W-1000, Berlin 33, Federal Republik of Germany 2. Fritz-Haber-Institut, Faraday-Weg 4-6, W-1000, Berlin 33, Federal Republic of Germany
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Abstract: | The following calculations are based on the local density approximation potential (LDA) of W. Ekardt for the spherical jellium-background model (SJBM). Taking into account the smooth shape of the potential, the WKB approximation was used to calculate the energy and angular dependence of the electron scattering cross-sections fo rsmall Na clusters. The number of phase shifts needed to describe the scattering in the range of energies <4.5 eV increases with the size of cluster. The calculated elastic electron scattering cross-sections for the Na clusters, corresponding to the shell closings (8, 20, 40), are exhibiting a pronounced peak structure, correlated with resonance states. The computed peaks of the angular dependences of the cross-sections on energy are shifted to small angles with increasing the cluster size. The absence of fragmentation at these small electron energies presents a challenge for the experimentalists. |
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