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- W2045642719 startingPage "2316" @default.
- W2045642719 abstract "A microscopic theory of linear response based on the Vlasov equation is extended to systems having spheroidal equilibrium shape. The solution of the linearized Vlasov equation, which gives a semiclassical version of the random-phase approximation, is studied for electrons moving in a deformed equilibrium mean field. The deformed field has been approximated by a cavity of spheroidal shape, both prolate and oblate. Contrary to spherical systems, there is now a coupling among excitations of different multipolarity induced by the interaction among constituents. Explicit calculations are performed for the dipole response of deformed clusters of different size. In all cases studied here, the photoabsorption strength for prolate clusters always displays a typical double-peaked structure. For oblate clusters we find that the high-frequency component of the plasmon doublet can become fragmented in the medium size region $(Nensuremath{sim}250).$ This fragmentation is related to the presence of two kinds of three-dimensional electron orbits in oblate cavities. The possible scaling of our semiclassical equations with the valence electron number and density is investigated." @default.
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- W2045642719 date "2000-01-15" @default.
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- W2045642719 title "Semiclassical theory of surface plasmons in spheroidal clusters" @default.
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- W2045642719 doi "https://doi.org/10.1103/physrevb.61.2316" @default.
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