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...

The inelastic mean free path (IMFP) is an index of how far an electron on average travels through a solid before losing energy. If a monochromatic, primary...

Free molecular flow describes the fluid dynamics of gas where the mean free path of the molecules is larger than the size of the chamber or of the object...

vibrational molecular motions. In this same work he introduced the concept of mean free path of a particle. In 1859, after reading a paper about the diffusion of...

there are no interactions, thus the mean free path should be infinite. The Drude model considered the mean free path of electrons to be close to the distance...

(Kn) is a dimensionless number defined as the ratio of the molecular mean free path length to a representative physical length scale. This length scale...

when the scale length of a system is comparable to or smaller than the mean free path of the particles involved. An example of this is in a long pore with...

Electron Inelastic Mean Free Paths in Solids". Surf. Interf. Anal. 1 (1): 2-10. doi:10.1002/sia.740010103. "XPS: The Mean Free Path". lasurface.com. Monochromatic...

collide with each other. The mean free time for a molecule in a fluid is the average time between collisions. The mean free path of the molecule is the product...

macroscopic cross section Σ: R = Σ Φ {\displaystyle R=\Sigma \,\Phi } The mean free path λ of a random particle is the average length between two interactions...

the mean free paths were found to be limited by "internal boundary scattering" to length scales of 10−2 cm to 10−3 cm. The phonon mean free path has been...

container through a hole of diameter considerably smaller than the mean free path of the molecules. Such a hole is often described as a pinhole and the...

when field emission from the cathode surface becomes important. The mean free path of a molecule in a gas is the average distance between its collision...

molecules between collisions (mean free path) is greater than the diameter of the receptacle that contains it. If the mean free path is much greater than the...

obey Newton's second law of motion at non-relativistic speeds. The mean free path of a particle can be described as the average length that the particle...

scattering event. Kinetic diameter is related to the mean free path of molecules in a gas. Mean free path is the average distance that a particle will travel...

comparable to or less than a radiation mean free path, such as in local thermal equilibrium. In practice, the mean opacity for Thomson electron scattering...

freedom can be measured capacitively. At atmospheric pressure, the mean free path of air is about 70 nm. A turbomolecular pump can work only if those...

total interaction cross section σ (typically measured in barns), the mean free path of a prompt neutron is ℓ − 1 = n σ {\displaystyle \ell ^{-1}=n\sigma...

of secondary electrons depends on the energy. Plotting the inelastic mean free path as a function of energy often shows characteristics of the "universal...

1 {\displaystyle 1} . The quantity λ {\displaystyle \lambda } , the mean free path, measures the average distance a molecule travels between collisions...

proportional to the mean free path. Knudsen diffusion occurs when the pore diameter is comparable to or smaller than the mean free path of the molecule diffusing...

momentum-transfer mean free path and the momentum-transfer collision frequency are difficult to calculate. Many other mean free paths can be defined. In...

bidirectional scattering distribution function (BSDF), S-matrices, and mean free path. When radiation is only scattered by one localized scattering center...

the cross section of a two-particle collision (SI unit: m2), λ is the mean free path between collisions (SI unit: m), n is the number density of the target...

successively lower frequencies as atmospheric pressure decreases, or as the mean free path increases. For this reason, the concept of speed of sound (except for...

terms of an approximately constant "mean free path" for lattice phonons, and that the value of the mean free path is of the order of magnitude of the...

molecules experience one collision on average, then at this position the mean free path of a molecule is equal to one pressure scale height. This is shown in...

the mean free path is λ = 1 f t = 0.305 m {\displaystyle \lambda =1\,\mathrm {ft} =0.305\,\mathrm {m} } . Because of this large free mean path aerodynamic...

and chemical composition. One of the most important parameters is the mean free path (MFP) of residual gases, which indicates the average distance that molecules...