High order vibration modes of glass embedded AgAu nanoparticles

TL;DR

This study uses high-resolution Raman scattering to analyze the vibrational modes of embedded AgAu nanoparticles, revealing harmonic contributions and dominant quadrupolar modes, supported by theoretical modeling.

Contribution

It provides a detailed experimental and theoretical analysis of high order vibrational modes in embedded nanoparticles, highlighting the significance of specific harmonics.

Findings

Efficient scattering by harmonics of quadrupolar and spherical modes.

Dominant Raman response from quadrupolar modes.

Selective contribution of certain quadrupolar harmonics.

Abstract

High resolution low frequency Raman scattering measurements from embedded AgAu nanoparticles unveil efficient scattering by harmonics of both the quadrupolar and the spherical modes. Comparing the experimental data with theoretical calculations that account for both the embedding medium and the resonant Raman process enables a very complete description of the observed multiple components in terms of harmonics of both the quadrupolar and spherical modes, with a dominating Raman response from the former ones. It is found that only selected harmonics of the quadrupolar mode contribute significantly to the Raman spectra in agreement with earlier theoretical predictions.