Density induced crossover of electron mobilities in fluid C3 hydrocarbons; Liquid phase behavior

Gee, Norman; Freeman, Gordon R.

doi:10.1016/0146-5724(80)90141-7

Cited by 9 publications

(5 citation statements)

References 28 publications

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“…The shape of the curve is an intermediate to those observed previously in ethane (4) and cyclopropane (6). However, the low density value of np, in dimethyl ether is 50-fold lower than those for ethane and cyclopropane.…”

Section: Electronssupporting

confidence: 46%

“…Dense gas and liquid In many nonpolar and slightly polar gases the values of n p, decrease at high densities to reach a minimum at a density roughly half that of the critical fluid (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). The ratio of the value of np, at low densities to the minimum value in the dense gas is typically 2-3.…”

Section: (B) Field Effectmentioning

confidence: 99%

“…The liquid phase electron mobilities (Fig. 6) can be analyzed using the two-state model of electron transport widely applied to dielectric liquids (6,26,45). The relevant equations have been discussed (26,45) and are simply listed here.…”

Section: (B) Field Effectmentioning

confidence: 99%

“…The electrons can be ephemerally localized by density fluctuations; this transitory localization occurs in the heavier noble gases argon (1) and xenon (2) as well as in all hydrocarbons studied to date (3)(4)(5)(6)(7)(8)(9)(10). These hydrocarbons range from methane (3), which is the simplest alkane, and ethene (5) the simplest alkene, to more complex structures such as benzene and toluene (10).…”

Section: Introductionmentioning

confidence: 99%

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Electron and cation transport in fluid dimethyl ether: effects of density and temperature

Gee¹,

Freeman²

1982

Can. J. Chem.

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. 60, 1034 (1982). The effect of molecular electric dipole moment D on charge transport in fluids was examined by measurement of electron and ion mobilities in dimethyl ether (D = 1.3 D) and comparing them with the behavior in hydrocarbons. The fluid density was varied continuously from that of the normal vapor to that of the normal liquid, passing through the critical region. The density normalized mobility np,of electrons in dimethyl ether vapor at low densities is 30-fold smaller than that in propane, although for the cations np, in the ether is only 1 .4-fold smaller than that in the alkane. The permanent dipole moment of the ether dominates the scattering of low energy electrons but not that of cations. The electron momentum transfer cross section is roughly 33% larger than that predicted by the Altshuler point dipole model, and has a minimum at -0.12 eV. The energy gained from the electric field is removed mainly through inelastic collisions, even in the thermal energy range.Molecular clustering decreases both electron and ion mobilities, but the effect on the former is much larger due to the greater change in reduced mass. The extent of electron quasilocalization in the dense vapor of dimethyl ether is four times greater than that in nonpolar hydrocarbons. Electrons form relatively stable localized states in the liquid at nln, > 2.0. Ion mobility undergoes a transition from "density control" to "viscosity control" with increasing density in the low density liquid. Viscosity control is operative at nln, > 2.4.NORMAN GEE et GORDON R. FREEMAN. Can. J. Chem. 60, 1034Chem. 60, (1982. On a etudie l'effet du moment dipolaire electrique molCculaire D sur le transport de charge dans les fluides en mesurant les mobilites des electrons et des ions dans I'ether methylique (D = 1,3 D) et en les comparant avec leur comportement dans les hydrocarbures. On a fait varier la densite du fluide d'une f a~o n continue partir de celle de la vapeur normale a celle du liquide normal en passant par la region critique. La mobilite normalisee pour la densite, np,, des electrons dans la vapeur d'ether a d e faibles densites est 30fois plus petite que celle dans le propane, bien que le valeur de np, des cations soit 1,4 fois plus petit dans 1'Cther que dans l'alcane. Le moment dipolaire permanent de l'tther domine la dispersion des electrons de faible Cnergie mais pas celle des cations. La section droit de transfert du momentum de l'electron est approximativement 33% plus grande que celle predite par le modkle du point dipolaire de Altshuler et il a un minimum a -0,12 eV. L'Cnergie gagnee a partir du champ Clectrique est enlevee principalement a travers les collisions non Clastiques, mCme dans le domaine d'energie thermique.L'entassement moleculaire diminue les mobilites des electrons et des ions, mais l'effet du premier est plus grand a cause d'une plus grande variation de la masse reduite. Le taux de quasilocalisation de l'electron dans la vapeur dense d'ether est 4 fois plus grand que celui dans les hydrocrabures non polaires. L...

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Section: Electronssupporting

confidence: 46%

Section: (B) Field Effectmentioning

confidence: 99%

Section: (B) Field Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electron and cation transport in fluid dimethyl ether: effects of density and temperature

Gee¹,

Freeman²

1982

Can. J. Chem.

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“…due to the Ioffe-Regel effect in ethane (40,41), propane (5,6,42), and n-butane ( 6 ) , but it is obscured by the decrease of n p caused by quasilocalization (6,40) under the conditions of experiment (Table 1). Heating the gas decreases the magnitude of the density fluctuations and therefore decreases the extent of quasilocalization; the value of (np.…”

Section: (D) Nonspherical Alkanesmentioning

confidence: 99%

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

Gee¹,

Freeman²

1986

Can. J. Chem.

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. 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]

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Correlation of positronium yield with excess Electron Mobility in Liquid Neopentane

1982

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Density induced crossover of electron mobilities in fluid C3 hydrocarbons; Liquid phase behavior

Cited by 9 publications

References 28 publications

Electron and cation transport in fluid dimethyl ether: effects of density and temperature

Electron and cation transport in fluid dimethyl ether: effects of density and temperature

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

Correlation of positronium yield with excess Electron Mobility in Liquid Neopentane

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