Angle-resolved Valence EELS of a Single Crystal Gold Sample

Electron energy loss spectroscopy (EELS) in a TEM can measure the optical response of individual nanostructures at high spatial resolution [1] and obtain structure and morphology of the individual nanostructures. Here we show that high quality valence EELS (VEELS) can be acquired and interpreted to well below 2 eV in an instrument equipped with a cold field emission gun (CFEG) and a standard Gatan Image Filter (GIF) TridiemTM. We provide interpretation of the main spectral feature in the momentum-resolved EELS (qEELS) spectrum.