scholarly journals Pitch-angle diffusion coefficients in test particle simulations and the estimation of the particle parallel mean free path

2019 ◽  
Vol 1380 ◽  
pp. 012141
Author(s):  
C Pleumpreedaporn ◽  
A P Snodin
Keyword(s):  
Free Path ◽  
Test Particle ◽  
Diffusion Coefficients ◽  
Pitch Angle ◽  
Mean Free Path ◽  
Particle Simulations

scholarly journals DETERMINING PITCH-ANGLE DIFFUSION COEFFICIENTS FROM TEST PARTICLE SIMULATIONS

2016 ◽  
Vol 833 (2) ◽  
pp. 223 ◽  
Author(s):  
Alex Ivascenko ◽  
Sebastian Lange ◽  
Felix Spanier ◽  
Rami Vainio
Keyword(s):  
Test Particle ◽  
Diffusion Coefficients ◽  
Pitch Angle ◽  
Particle Simulations

Cation mobilities in liquid and supercritical C1–C4 hydrocarbons

1980 ◽  
Vol 58 (14) ◽  
pp. 1490-1494 ◽  
Author(s):  
Norman Gee ◽  
Gordon R. Freeman
Keyword(s):  
Free Path ◽  
Ion Mobility ◽  
Diffusion Coefficients ◽  
Critical Region ◽  
Mean Free Path ◽  
Liquid Viscosity ◽  
Boiling Points ◽  
Rough Approximation ◽  
The Relationship ◽  
Lower Liquid

The relationship between ion mobility and liquid viscosity is commonly expressed as μ [Formula: see text] η−m. In hydrocarbons the value of m tends to be near 1.0 at η > 5 mP, m > 1.0 at ~5 < η < 1 mP, and m < 1.0 at η < 0.5 mP. Thus there is a maximum in a plot of μη against η−1 and Walden's rule (m = 1.0) is only a rough approximation. The decrease of μη as the critical region is approached is accompanied by an increase in the ratio of diffusion coefficients Dmolec/Dion. Ion mobilities in the liquids well below their normal boiling points are chiefly controlled by the fluidity. At higher temperatures and concomitant lower liquid densities and viscosities μη first increases, due to an increasing ion mean free path, then decreases as the critical region is approached, due to the increasing liquid compressibility and consequent electrostriction about the ion.

scholarly journals Anisotropic Diffusion in Electron Swarms

1975 ◽  
Vol 28 (5) ◽  
pp. 533 ◽  
Author(s):  
JLA Francey ◽  
DA Jones
Keyword(s):  
Free Path ◽  
Diffusion Coefficients ◽  
Anisotropic Diffusion ◽  
Collision Frequency ◽  
Mean Free Path ◽  
Distribution Functions ◽  
Isotropic Diffusion ◽  
Electrostatic Fields ◽  
Frequency Interaction

We show that the distribution functions derived by Parker (1963) in his analysis of the TownsendHuxley experiment can be used to calculate DL/D, the ratio of longitudinal to isotropic diffusion coefficients for electron swarms in electrostatic fields in gases. In the case of a constant collision frequency interaction our results agree with previous calculations, whilst for a constant mean free path we find DL/D = 0�58. This result is some 16% higher than previously published values but provides better agreement with experiment for electrons in helium.

Inelastic mean free path and phase-shift determinations in NiO, using EXELFS

1993 ◽  
Vol 3 (7) ◽  
pp. 1649-1659
Author(s):  
Mohammad A. Tafreshi ◽  
Stefan Csillag ◽  
Zou Wei Yuan ◽  
Christian Bohm ◽  
Elisabeth Lefèvre ◽  
...  
Keyword(s):  
Phase Shift ◽  
Free Path ◽  
Mean Free Path ◽  
Inelastic Mean Free Path
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