Can an electron microscope see the structure inside an atom?
Electron microscopes cannot see the internal structure of atoms. Atoms constitute the basic unit of chemical elements and are the smallest particles in chemical changes, that is, particles that cannot be subdivided by ordinary chemical changes. Electron microscopes can observe atoms, but it is extremely difficult to directly observe the internal structure of atoms (nuclei and electron clouds).
Electron lenses are used to focus electrons and are the most important part of an electron microscope tube. Generally, a magnetic lens is used, and sometimes an electrostatic lens is used. It uses the space electric or magnetic field symmetrical to the axis of the lens barrel to bend the electron trajectory towards the axis to form a focus. It acts like an optical lens (convex lens) in an optical microscope and is used to focus a light beam.
Types and uses of electron microscopes:
Electron microscopes can be divided into transmission electron microscopes, scanning electron microscopes, reflection electron microscopes and emission electron microscopes according to their structure and use.
Transmission electron microscopy is often used to observe fine material structures that cannot be resolved by ordinary microscopes; scanning electron microscopy is mainly used to observe the surface morphology of solids, and can also be used in combination with X-ray diffractometers or electron energy spectrometers. Forms electron probes for material composition analysis; Emission Electron Microscopy is used to study self-emitting electron surfaces.
