Confronting theoretical results of localized and additional surface plasmon resonances in silver nanoparticles with electron energy-loss spectroscopy measurements

Raza et al. recently observed the extraordinarily large energy blueshifts of localized surface plasmon resonances and additional in silver nanoparticles encapsulated silicon nitride, which are not fully understood yet. By using quantum model consisting two subsystems respectively for describing center mass intrinsic motions conduction electrons a metallic nanosphere coupling occurred between outside nanosphere, we firstly deduced general line broadening size-dependence resonances, removes divergent defect usual 1/R size-dependence. Secondly, proposed that resonance originates from transition first excited state to ground subsystem with levels corrected by degenerate pairs system composed electrons. Then, implemented this generation mechanism nitride calculated results well consistent experimental results. Furthermore, obtained new expression successfully explained few-nanometer nitride. Finally, energies resting on carbon films perfectly explain measurements Scholl al..