@article{HoevelFritzHilgeretal.1993, author = {H{\"o}vel, H. and Fritz, S. and Hilger, A. and Kreibig, U. and Vollmer, Michael}, title = {Width of cluster plasmon resonances: Bulk dielectric functions and chemical interface damping}, series = {In: Phys. Rev. B 48 (1993) 24, 18178-18188}, journal = {In: Phys. Rev. B 48 (1993) 24, 18178-18188}, doi = {10.1103/PhysRevB.48.18178}, year = {1993}, abstract = {The damping of collective electron resonances in clusters which develop into plasmon polaritons at larger sizes is investigated for free, supported, and embedded neutral metal clusters. Embedding of free 2 nm Ag clusters of 2-nm diameter into a SiO2 matrix leads to an increase of the width of the resonances by more than a factor of 3. The optical spectra are compared with the Mie theory using size-effect-modified dielectric functions of the solid state. The results corroborate the assumption that the widths of the resonances strongly depend on chemical interface effects. The results are briefly discussed with regard to limited-mean-free-path and quantum-size-effect theories and a recent approach by Persson. It is demonstrated that the widths of the spectra of supported and embedded clusters have to be interpreted with care since true intrinsic size effects of the clusters appear to be less effective than previously believed and can be obscured by the chemical interface damping. © 1993 The American Physical Society}, language = {en} } @incollection{VollmerKreibig1992, author = {Vollmer, Michael and Kreibig, U.}, title = {Collective excitations of large metal clusters}, series = {In: Nuclear physics concepts in the study of atomic cluster physics : proceedings of the 88th W.-E.-Heraeus-Seminar, held at Bad Honnef, FRG, 26 - 29 November 1991 / R. Schmidt ... (ed.). - Berlin [u.a.] : Springer, 1992. - (Lecture notes in physics ; Vol. 404). - ISBN 3-540-55625-7 ; 0-387-55625-7. - S. 266-276}, booktitle = {In: Nuclear physics concepts in the study of atomic cluster physics : proceedings of the 88th W.-E.-Heraeus-Seminar, held at Bad Honnef, FRG, 26 - 29 November 1991 / R. Schmidt ... (ed.). - Berlin [u.a.] : Springer, 1992. - (Lecture notes in physics ; Vol. 404). - ISBN 3-540-55625-7 ; 0-387-55625-7. - S. 266-276}, doi = {10.1007/3-540-55625-7_30}, pages = {266 -- 276}, year = {1992}, abstract = {Studies of the evolution of the optical properties of metal clusters as a function of size have gained considerable attention in the last few years. One theoretical approach starts from large metal clusters, which can be described by classical electrodynamics, provided the dielectric functions of the clusters are known. the resulting resonant features in the absorption spectra are commonly called surface plasmons and are collective excitations of the electron system.The present paper discusses the electrodynamic (Mie) theory for large clusters of different metals, also considering the range of validity of this approach towards smaller cluster sizes. More details can be found in an extended review on this topic which is to be published soon [1].}, language = {en} }