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The inelastic mean free path of electrons can roughly be described by a universal curve that is the same for all materials. [1] [3] The knowledge of the IMFP is indispensable for several electron spectroscopy and microscopy measurements. [4]
Here mfp is the mean free path of electron inelastic scattering, which has been tabulated for most elemental solids and oxides. [ 14 ] The spatial resolution of this procedure is limited by the plasmon localization and is about 1 nm, [ 6 ] meaning that spatial thickness maps can be measured in scanning transmission electron microscopy with ~1 ...
In nuclear physics, area cross-sections (e.g. σ in barns or units of 10 −24 cm 2), density mean free path (e.g. τ in grams/cm 2), and its reciprocal the mass attenuation coefficient (e.g. in cm 2 /gram) or area per nucleon are all popular, while in electron microscopy the inelastic mean free path [14] (e.g. λ in nanometers) is often ...
Inelastic scattering is common in molecular collisions. Any collision which leads to a chemical reaction will be inelastic, but the term inelastic scattering is reserved for those collisions which do not result in reactions. [3] There is a transfer of energy between the translational mode (kinetic energy) and rotational and vibrational modes.
In a solid, inelastic scattering events also contribute to the photoemission process, generating electron-hole pairs which show up as an inelastic tail on the high BE side of the main photoemission peak. In fact this allows the calculation of electron inelastic mean free path (IMFP).
In physics, mean free path is the average distance over which a moving particle (such as an atom, a molecule, or a photon) travels before substantially changing its direction or energy (or, in a specific context, other properties), typically as a result of one or more successive collisions with other particles.
Compton scattering, so named for Arthur Compton who first observed the effect in 1922 and which earned him the 1927 Nobel Prize in Physics; [25] is the inelastic scattering of a high-energy photon by a free charged particle.
Secondary electrons are also the main means of viewing images in the scanning electron microscope (SEM). The range of secondary electrons depends on the energy. Plotting the inelastic mean free path as a function of energy often shows characteristics of the "universal curve" [1] familiar to electron spectroscopists and surface analysts.