| Abstract
| - A signal due to coherently excited vibrational motion has been observed in polydisperse silver nanoparticlesamples. The particles were synthesized via a wet chemistry seed mediated method, which yields differentparticle shapes, including spheres, rods, and irregular triangular-shaped particles. The measured vibrationalperiods were compared to the results from continuum mechanics calculations. This analysis shows that theobserved signal arises from the triangular-shaped particles, rather than the rods or spheres. The period ofvibration increases as the dimensions of the triangular-shaped particles increase; specifically, we find that theperiod is given by 2h/cl, where h is the bisector of the triangle and cl is the longitudinal speed of sound insilver.
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