Electron transport in dense gases: limitations on the Ioffe-Regel and Mott criteria

Abstract

. Can. J. Chem. 64, 1810Chem. 64, (1986. In the gas phase, the Ioffe-Regel criterion that electron transport becomes modified when the mean free path equals the electron wavelength (L = A) applies clearly only to helium and hydrogen, which have a net repulsive interaction with electrons. The Mott criterion, that when L = A/2r the electron is in a localized state. also applies to these two gases. The two criteria are less effective for molecules that have net attractive interactions with the electrons, because the interactions are not simply additive. They are not useful for xenon gas. The criteria are also assessed for: ( a ) several highly polarizable, spherical and nonspherical molecules; (b) polar molecules; (c) [Traduit par la revue]

Ab initioelectron scattering cross-sections and transport in liquid xenon

“…It has been shown [1] that this simplistic approach cannot explain the non-linearities seen in the experiments . As we have described in Boyle et al [1], there are other theoretical approaches to exploring the effect of liquid correlations on the transport of light particles [10][11][12][13][14][15], however these either require empirical inputs, are applicable only close to equilibrium, or have heuristically combined the liquid effects identified above to obtain an effective cross-section.…”

Transition to collective behaviour of a quantum particle in a classical gas

“…A different; but related, index of the independent-particle regime is provided by the ratio of the mean de Broglie wavelength ( ( h l m u ) , exactly twice the thermal wavelength) to the mean free path. Here, as well, equality of these numbers indicates that the light particle is simultaneously interacting with multiple fluid molecules (Gee and Freeman 1986). Estimates of the mean free path of the o-Ps atom may be obtained from the simple approximation (Reichl 1980) l/(pu).…”