Topic
Mean free path
About: Mean free path is a research topic. Over the lifetime, 4412 publications have been published within this topic receiving 114418 citations.
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TL;DR: The real and imaginary parts of the complex refractive index of arc-evaporated carbon films have been obtained over the range of photon energies h..omega.. from 0.5 to 62.0 eV as discussed by the authors.
Abstract: The real and imaginary parts of the complex refractive index, n(..omega..) = n(..omega..)+ik(..omega..), of arc-evaporated carbon films have been obtained over the range of photon energies h..omega.. from 0.5 to 62.0 eV. Values of k(..omega..) obtained from transmission measurements in this energy range were combined with values of k(..omega..) from the literature in the infrared and soft-x-ray regions. A Kramers-Kronig analysis then yielded the values of n(..omega..). The density of the arc-evaporated carbon films was found to be 1.90 +- 0.05 g cm/sup -3/ by the ''sink-float'' method, and their thicknesses were determined optically. A sum-rule calculation yielded the effective numbers of valence and core electrons to be 4.2 and 1.8, respectively. The experimental values determined for n(..omega..) have been used to estimate values of the inelastic mean free path ..lambda..(E) for electrons of energy E from 200 to 3000 eV in amorphous carbon. Good agreement is found between ..lambda..(E) and experimentally determined values of electron attenuation length L(E) from the literature.
40 citations
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01 May 1964
TL;DR: In this paper, the usual theory of phonon interaction may be extended to cover the case of one phonon having a wavelength larger than the mean free path of those with which it interacts.
Abstract: It is shown how the usual theory of phonon interaction may be extended to cover the case of one phonon having a wavelength larger than the mean free path of those with which it interacts. The results are applied to a consideration of the absorption of sound in dielectrics at arbitrary temperature.
40 citations
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TL;DR: In this article, a statistical study of published intensity-time profiles of proton and electron solar particle events from 1967 to 1974 was performed to examine systematically the temporal and rigidity dependence of the interplanetary scattering mean free path from approximately 1000 to 3000 MV.
Abstract: The paper reports a statistical study of published intensity-time profiles of proton and electron solar particle events from 1967 to 1974. The purpose of the study was to examine systematically the temporal and rigidity dependence of the interplanetary scattering mean free path from approximately 1000 to 3000 MV. The observed t-max, the time from release of particles at the sun to the time of maximum flux at the spacecraft, were interpreted in terms of a propagation model to obtain the average radial scattering mean-free path. This path (1) appears to be species independent when it is derived from proton and electron solar particle events, (2) varies less than a factor of 2 from solar maximum to solar minimum, and (3) is nearly rigidity independent below approximately 500 MV. The path values obtained at low rigidities are inconsistent with path values derived theoretically from the interplanetary magnetic field fluctuations.
40 citations
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TL;DR: In this article, the cross-plane thermal transport along the pore axial direction in nanoporous silicon thin films was investigated by using the phonon Boltzmann transport equation and the Monte Carlo (MC) simulations.
40 citations
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TL;DR: In this article, electron attenuation lengths in condensed molecular solids have been measured utilizing monochromatized synchrotron radiation from the NBS SURF-II storage ring.
40 citations