Measurement of dynamic potential distribution during the propagation of a local arc along a polluted surface

1990 ◽  
Vol 25 (4) ◽  
pp. 757-761 ◽  
Author(s):  
S. Li ◽  
R. Zhang ◽  
K. Tan
Keyword(s):  
Potential Distribution ◽  
Dynamic Potential

Numerical analysis of monoenergetic electrons energy effect on dynamic potential profile of plasma sheath

2013 ◽  
Vol 79 (5) ◽  
pp. 509-512 ◽  
Author(s):  
M. SHARIFIAN
Keyword(s):  
Numerical Analysis ◽  
Potential Distribution ◽  
Plasma Sheath ◽  
Cathode Potential ◽  
Energy Effect ◽  
Fast Electrons ◽  
Sheath Region ◽  
Dynamic Potential ◽  
The Finite Difference Method ◽  
Slow Electrons

AbstractThe dynamic behavior of the electric potential distribution of a plasma sheath region in the presence of monoenergetic electrons with two different values of energy, larger (fast electrons) and smaller (slow electrons) than the cathode potential energy, is examined numerically by the finite difference method. Exploring and comparing the plots of numerical computation results shows that the time evolution of the non-monotonic potential distribution heavily depends on the energy of monoenergetic electrons.

The effects of surface absorbed monolayer microdiffraction patterns

1988 ◽  
Vol 46 ◽  
pp. 680-681
Author(s):  
M. Pan ◽  
J.M. Cowley
Keyword(s):  
Surface Potential ◽  
Electron Probe ◽  
Potential Distribution ◽  
Crystal Surface ◽  
Normal Direction ◽  
Surface Image ◽  
Extended Surface ◽  
Gas Molecules ◽  
Surface Nature ◽  
Electron Microdiffraction

Electron microdiffraction patterns, obtained when a small electron probe with diameter of 10-15 Å is directed to run parallel to and outside a flat crystal surface, are sensitive to the surface nature of the crystals. Dynamical diffraction calculations have shown that most of the experimental observations for a flat (100) face of a MgO crystal, such as the streaking of the central spot in the surface normal direction and (100)-type forbidden reflections etc., could be explained satisfactorily by assuming a modified image potential field outside the crystal surface. However the origin of this extended surface potential remains uncertain. A theoretical analysis by Howie et al suggests that the surface image potential should have a form different from above-mentioned image potential and also be smaller by several orders of magnitude. Nevertheless the surface potential distribution may in practice be modified in various ways, such as by the adsorption of a monolayer of gas molecules.

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