Time-dependent density functional calculation of the energy loss of antiprotons colliding with metallic nanoshells

Time-dependent density functional theory is used to study the interaction between antiprotons and metallic nanoshells. The ground state electronic proper-ties of the nanoshell are obtained in the jellium approximation. The energy lost by the antiproton during the collision is calculated and compared to that suffered by antiprotons traveling in metal clusters. The resulting energy loss per unit path length of material in thin nanoshells is larger than the corresponding quantity for clusters. It is shown that the collision process can be interpreted as the antiproton crossing of two nearly bi-dimensional independent metallic systems. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.