KEYWORDS: Near field optics, Molecules, Molecular photonics, Chemical species, Photons, Photonic microstructures, Near field, Molecular spectroscopy, Molecular lasers, Electron microscopy
We theoretically reveal novel quantum effects in the interaction between free electrons and optically illuminated multilevel atomic systems. Specifically, we show that the resulting electron energy-loss spectra are radically altered in the presence of intense laser irradiation, giving rise to transition energy shifts and new loss features associated with the combined action of photon and electron exchanges with the atomic system, in analogy to Raman scattering. Besides their fundamental interest, our results provide the basis for a new form of spectrally resolved microscopy in which the external illumination is used to enhance the spectral resolution and strength of electron-atom interactions.
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