Rather than the light used in a traditional microscope, this technique uses focused beams of electrons to illuminate a sample and form images with atomic resolution. (sciencedaily.com)
The accelerator produces a small, intensely concentrated beam of electrons called a pencil beam. (sciencedaily.com)
Under a strong electric field, the cathode emits tight, high - speed beams of electrons through its sharp nanotube tips — a phenomenon called field emission. (sciencedaily.com)