Photoelectron spectroscopy uses the principle of the photoelectric effect to measure the kinetic energy (and thus the binding energy), photoelectron intensity and angular distribution of photoelectrons emitted from a sample of monochromatic radiation from a sample, and applies this information to A technique for studying the electronic structure of atoms, molecules, condensed phases, especially solid surfaces. For solids, photoelectron spectroscopy is a surface-sensitive technique. Although incident photons can penetrate deep into the solid, only the photoelectrons in a thin layer of 20-30 angstroms under the surface of the solid can escape (the average free path of inelastic scattering of photons is 10-10 times larger than that of electrons), so photoelectrons Reflects information from solid surfaces.
