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Phys Rev Lett. 2004 Jul 30;93(5):055506. Epub 2004 Jul 30.

Long lived acoustic vibrational modes of an embedded nanoparticle.

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  • 1Laboratoire de Recherche sur la Réactivité des Solides, UMR 5613 CNRS-Université de Bourgogne, 9 avenue A. Savary, BP 47870 - 21078 Dijon, France.


Classical continuum elastic calculations show that the acoustic vibrational modes of an embedded nanoparticle can be lightly damped even when the longitudinal plane wave acoustic impedances Z(o)=rhov(L) of the nanoparticle and the matrix are the same. It is not necessary for the matrix to be less dense or softer than the nanoparticle in order to have long lived vibrational modes. A corrected formula for acoustic impedance is provided for the case of longitudinal spherical waves. Continuum boundary conditions do not always accurately reflect the microscopic nature of the interface between the nanoparticle and the matrix, and a multilayer model of the interface reveals the possibility of additional reduction of mode damping.

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