illustrates the absorbed optical power maps for select excited plasmon resonance modes corresponding to several beam positions. The most significant plasmon modes were the dipolar transverse mode and higher-order dark modes that are only excited by point-like sources such as electron beam irradiation. The highly localized nature of the STEM probe compared to optical radiation enables a broader variety of LSPR modes to be established compared to photoillumination. The dipolar longitudinal mode exhibited comparatively weak excitation across all beam positions. The absorbed power spectra, i.e., power available for conversion into plasmons, are plotted in Figure for each simulated beam position. The absorbed power spectra re-affirm that the transverse and higher-order modes were significantly excited, exhibiting prominent peaks at the corresponding resonant frequencies. Ultimately, the spatially dependent power absorption integrated over all wavelengths and averaged over all studied electron beam positions was dominated by the higher order mode at ~620 nm (Figure ). The spatially dependent hot electron generation rates were calculated assuming all the absorbed power per incident electron was converted to hot electrons with energies of 2 eV (Figure ). Although the displayed values are upper-limit estimates that neglect potentially competing non-radiative decay processes, the distribution of hot electron generation hot spots in Figure qualitatively resembles LP-TEM observations of enhanced deposition at the nanorod sides and corners (Figure ). Both surface hot electron generation rates (Figure ) and surface growth velocities (Figure )