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Descripción
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| Analytical expressions for the collision frequency for momentum transfer and the friction force experienced by a Maxwellian ion population drifting with respect to the uniform neutral atom background are derived. The calculations make use of different models for the collision cross section for momentum transfer accounting for the relative speed vr between the colliding particles. These results are compared with the currently used semi-empirical equations for the friction force and collision frequency in the fluid equations for weakly ionized plasmas. The kinetic model calculations are in agreement for suprathermal ion flows while they present discrepancies of orders of magnitude for subthermal ion drift speeds ud. However, for the collision cross section sigma = 1/vr, the magnitude of the friction force results proportional to ud and the collision frequency becomes constant regardless of the magnitude of the ion drift speed in both cases. These results are relevant for ion populations drifting in a plasma which could be approximated by shifted Maxwellian distributions, as in collisional plasma sheaths or plasma double layers | |
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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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PHYSICAL REVIEW E |
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ISSN
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1539-3755 |
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Factor de impacto JCR
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2,483 |
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Información de impacto
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Volumen
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78 |
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DOI
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10.113/PhysRevE.78.026407 |
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Número de revista
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8 |
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Desde la página
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026407-1 |
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Hasta la página
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6 |
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Mes
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AGOSTO |
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Ranking
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