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: In this paper, measurements of ion energy distribution functions were made at the grounded electrode of a parallel plate radiofrequency discharge by means of a gridded energy analyser in discharges in Ar, He, and O2 at pressures of the order of 0.001-0.1 mbar.
Abstract: Measurements of ion energy distribution functions were made at the grounded electrode of a parallel plate radiofrequency discharge by means of a gridded energy analyser in discharges in Ar, He, and O2 at pressures of the order of 0.001-0.1 mbar. In this regime the transition from the collisionless space charge sheath (in front of the electrode) to a sheath dominated by collisions, mainly charge exchange collisions, appears. Although the Debye length is small compared to the mean free path for charge exchange, for high sheath voltages the sheath thickness increases and may exceed the mean free path. Measured distributions in Ar are compared to energy distribution functions calculated in a self-consistent sheath model, including charge exchange collisions. The agreement of theory and experiment is very good.
49 citations
TL;DR: The scattering-phase theorem recently derived in the laboratory is employed to extract tissue scattering properties from quantitative phase images using tissue path-length maps that contain nanoscale information about the tissue.
Abstract: We employed the scattering-phase theorem recently derived in our laboratory to extract tissue scattering properties from quantitative phase images Using tissue path-length maps that contain nanoscale information about the tissue, the scattering mean free path ls and anisotropy factor g were measured in a spatially resolved manner
49 citations
TL;DR: In this article, the electrical resistivity of the composite wires was experimentally investigated as a function of wire strain and temperature, and the observed decrease in conductivity with increasing wire strain is interpreted in terms of inelastic electron scattering at internal phase boundaries.
49 citations
TL;DR: In this paper, the thermoelectric power, resistivity and TCR of vacuum evaporated copper films were measured and the energy dependence of the electron mean free path and the area of the constant energy surface were obtained as 0.7 and -2.1 respectively.
49 citations
TL;DR: In this paper, the Onsager cross-coefficients b1 and b2, coupling growth and heat flow, are calculated for atomically rough surfaces of hcp 4He crystals, based on the premise that growth is limited by the collision of phonons and rotons with the interface.
Abstract: The growth coefficient K (the velocity of growth per unit chemical potential difference) and the Onsager cross-coefficients b1 and b2, coupling growth and heat flow, are calculated for atomically rough surfaces of hcp 4He crystals. The calculation is based on the premise, suggested by Andreev and Parshin, that growth is limited by the collision of phonons and rotons with the interface. The calculated K is compared with that obtained by Keshiskev et al. from the damping of melting-freezing waves. The theory assumes that the excitations are in the ballistic regime where their mean free path is large compared to the wavelength of the melting-freezing waves. In the experiment only the phonons satisfy this condition, yet the theory agrees with the data even when roton scattering is important Irreversible thermodynamics requires that the cross coefficients b1 and b 2 be equal. This is shown by direct calculation. The value of b1 and b2 depends on the ratio of two integrals over the phonon transmission coefficient and it is evaluated for two models of the transmission. The theory agrees fairly well with a recent measurement of b1. A calculation of the dissipation in the hydrodynamic regime, where the free path is short, shows that the damping of melting-freezing waves should have a different dependence on frequency compared to the ballistic regime.
49 citations