Resonant Raman Scattering by quadrupolar vibrations of Ni-Ag Core-shell Nanoparticles

Details Resonant Raman Scattering by quadrupolar vibrations of Ni-Ag Core-shell Nanoparticles Resonant Raman Scattering by quadrupolar vibrations of Ni-Ag Core-shell Nanoparticles

2002-03-22

arxiv.org/abs/cond-mat/0203468v1

Phys. Rev. B, 65 (2002) 165422

Physics

Condensed Matter

3 figures. To be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.65.165422

Low-frequency Raman scattering experiments have been performed on thin films consisting of nickel-silver composite nanoparticles embedded in alumina matrix. It is observed that the Raman scattering by the quadrupolar modes, strongly enhanced when the light excitation is resonant with the surface dipolar excitation, is mainly governed by the silver electron contribution to the plasmon excitation. The Raman results are in agreement with a core-shell structure of the nanoparticles, the silver shell being loosely bonded to the nickel core.

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