Electron-Nucleus Interaction in a Finite Atomic Line Modulated by a Focussed Electric Field

1995 ◽  
pp. 59-66
Author(s):  
C. Joachim ◽  
J. L. Heully ◽  
M. Devel ◽  
C. Girard
Keyword(s):  
Electric Field ◽  
Atomic Line ◽  
Nucleus Interaction

Resolution in photoelectron microscopy

1991 ◽  
Vol 49 ◽  
pp. 458-459
Author(s):  
G. F. Rempfer
Keyword(s):  
Electron Microscopy ◽  
Electric Field ◽  
Ultraviolet Light ◽  
Uniform Field ◽  
Virtual Image ◽  
Lens System ◽  
Photoemission Electron Microscopy ◽  
Planar Electrode ◽  
Electron Lens ◽  
Photoemission Electron

In photoelectron microscopy (PEM), also called photoemission electron microscopy (PEEM), the image is formed by electrons which have been liberated from the specimen by ultraviolet light. The electrons are accelerated by an electric field before being imaged by an electron lens system. The specimen is supported on a planar electrode (or the electrode itself may be the specimen), and the accelerating field is applied between the specimen, which serves as the cathode, and an anode. The accelerating field is essentially uniform except for microfields near the surface of the specimen and a diverging field near the anode aperture. The uniform field forms a virtual image of the specimen (virtual specimen) at unit lateral magnification, approximately twice as far from the anode as is the specimen. The diverging field at the anode aperture in turn forms a virtual image of the virtual specimen at magnification 2/3, at a distance from the anode of 4/3 the specimen distance. This demagnified virtual image is the object for the objective stage of the lens system.

Field-assisted ionization theory for microscopists

1994 ◽  
Vol 52 ◽  
pp. 820-821
Author(s):  
Patrick P. Camus
Keyword(s):  
Electric Field ◽  
Electron Tunneling ◽  
Ionization Probability ◽  
Critical Distance ◽  
Tunneling Probability ◽  
Field Ionization ◽  
Radius Of Curvature ◽  
Field Evaporation ◽  
A Value ◽  
Ion Emission

The theory of field ion emission is the study of electron tunneling probability enhanced by the application of a high electric field. At subnanometer distances and kilovolt potentials, the probability of tunneling of electrons increases markedly. Field ionization of gas atoms produce atomic resolution images of the surface of the specimen, while field evaporation of surface atoms sections the specimen. Details of emission theory may be found in monographs.Field ionization (FI) is the phenomena whereby an electric field assists in the ionization of gas atoms via tunneling. The tunneling probability is a maximum at a critical distance above the surface,xc, Fig. 1. Energy is required to ionize the gas atom at xc, I, but at a value reduced by the appliedelectric field, xcFe, while energy is recovered by placing the electron in the specimen, φ. The highest ionization probability occurs for those regions on the specimen that have the highest local electric field. Those atoms which protrude from the average surfacehave the smallest radius of curvature, the highest field and therefore produce the highest ionizationprobability and brightest spots on the imaging screen, Fig. 2. This technique is called field ion microscopy (FIM).

Linear growth of instabilities on a liquid metal under normal electric field

1993 ◽  
Vol 3 (8) ◽  
pp. 1201-1225 ◽  
Author(s):  
G. N�ron de Surgy ◽  
J.-P. Chabrerie ◽  
O. Denoux ◽  
J.-E. Wesfreid
Keyword(s):  
Liquid Metal ◽  
Electric Field ◽  
Linear Growth ◽  
Normal Electric Field

Charge density wave in a transverse electric field

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-145-Pr10-147 ◽  
Author(s):  
M. Hayashi ◽  
H. Yoshioka
Keyword(s):  
Electric Field ◽  
Charge Density ◽  
Charge Density Wave ◽  
Transverse Electric ◽  
Density Wave ◽  
Transverse Electric Field

Hyperfine structure evolution in an electric field and determination of tensor polarizabilities in He (4 and 5 1D)

1987 ◽  
Vol 48 (2) ◽  
pp. 227-232 ◽  
Author(s):  
A. Denis ◽  
Y. Ouerdane ◽  
G. Docao ◽  
J. Désesquelles
Keyword(s):  
Electric Field ◽  
Hyperfine Structure ◽  
Structure Evolution

CRITICAL PROPERTIES OF T. G. S. AND R. S. AS DETERMINED BY a d. c. ELECTRIC FIELD METHOD

1972 ◽  
Vol 33 (C2) ◽  
pp. C2-235-C2-236
Author(s):  
A. LEVSTIK ◽  
M. BURGAR ◽  
R. BLINC
Keyword(s):  
Electric Field ◽  
Field Method ◽  
Critical Properties ◽  
Electric Field Method

LIQUID CRYSTLASLIGHT SCATTERING BY FLUCTUATIONS INDUCED BY AN APPLIED ELECTRIC FIELD IN A NEMATIC LIQUID CRYSTAL (APAPA)

1972 ◽  
Vol 33 (C1) ◽  
pp. C1-63-C1-67 ◽  
Author(s):  
M. BERTOLOTTI ◽  
B. DAINO ◽  
P. Di PORTO ◽  
F. SCUDIERI ◽  
D. SETTE
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Applied Electric Field
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