scholarly journals Generation mechanism for coherent LO phonons in surface-space-charge fields of III-V-compounds

1992 ◽  
Vol 55 (5) ◽  
pp. 482-488 ◽  
Author(s):  
T. Pfeifer ◽  
T. Dekorsy ◽  
W. K�tt ◽  
H. Kurz
Keyword(s):  
Space Charge ◽  
Generation Mechanism

Zur Entwicklung einer Elektronenlawine bei Überspannung in N2

1964 ◽  
Vol 19 (3) ◽  
pp. 346-353 ◽  
Author(s):  
H. Tholl
Keyword(s):  
Space Charge ◽  
Discharge Current ◽  
Light Flash ◽  
Generation Mechanism ◽  
Temporal Development ◽  
Electrical Field ◽  
Statistical Fluctuations ◽  
Electron Avalanches ◽  
Positive Ion ◽  
Good Agreement

In N2 (and in N2 with a small amount of CH4) electron avalanches and their development into the generation mechanism were investigated at μ⋛ 1 in a pulsed homogeneous electrical field. The temporal development of the avalanche currents was measured by photomultiplier techniques. The avalanches were started by a high number of electrons (≅ 103), released at the cathode by a short light flash; thus the discharge currents were free from statistical fluctuations. — The comparison of measured and calculated current shapes of the generation mechanism show good agreement. The influence of the positive ion space charge on the development of the discharge current is demonstrated. At higher overvoltages (> 20%) streamer mechanism is found; in a transition region (≅17%) both mechanism (streamer- and generation mechanism) are observed as concurring processes.

Electron holography of interfaces in electroceramics

1993 ◽  
Vol 51 ◽  
pp. 1088-1089
Author(s):  
Vinayak P. Dravid ◽  
V. Ravikumar ◽  
Richard Plass
Keyword(s):  
Space Charge ◽  
Direct Evidence ◽  
Materials Science ◽  
Theoretical Work ◽  
Electron Holography ◽  
Resolution Limit ◽  
Interference Phenomenon ◽  
X Ray ◽  
Electron Sources ◽  
Science Community

With the advent of coherent electron sources with cold field emission guns (cFEGs), it has become possible to utilize the coherent interference phenomenon and perform “practical” electron holography. Historically, holography was envisioned to extent the resolution limit by compensating coherent aberrations. Indeed such work has been done with reasonable success in a few laboratories around the world. However, it is the ability of electron holography to map electrical and magnetic fields which has caught considerable attention of materials science community.There has been considerable theoretical work on formation of space charge on surfaces and internal interfaces. In particular, formation and nature of space charge have important implications for the performance of numerous electroceramics which derive their useful properties from electrically active grain boundaries. Bonnell and coworkers, in their elegant STM experiments provided the direct evidence for GB space charge and its sign, while Chiang et al. used the indirect but powerful technique of x-ray microchemical profiling across GBs to infer the nature of space charge.

ELECTROLYTIC COLORATION IN ALKALI HALIDES. ROLE OF THE SPACE CHARGE ON THE COLOR PROPAGATION

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-86-C7-86
Author(s):  
M. T. MONTOJO ◽  
F. JAQUE ◽  
C. SÁNCHEZ
Keyword(s):  
Space Charge ◽  
Alkali Halides

EFFECTS OF SPACE CHARGE ON THE "EFFECTIVE CROSS SECTION"

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-755-C7-756
Author(s):  
N. S. Kopeika ◽  
T. Karcher ◽  
C.S. Ih.
Keyword(s):  
Space Charge ◽  
Cross Section ◽  
Effective Cross Section

Ionic space charge and dissolution of AgCl

1980 ◽  
Vol 41 (C6) ◽  
pp. C6-106-C6-108 ◽  
Author(s):  
L. S. Cain ◽  
N. Danieley ◽  
J.C.-Y. Lee ◽  
L. Slifkin
Keyword(s):  
Space Charge

THEORETICAL AND EXPERIMENTAL STUDY OF ICE IN THE PRESENCE OF A SPACE CHARGE

1987 ◽  
Vol 48 (C1) ◽  
pp. C1-93-C1-98
Author(s):  
A. V. ZARETSKII ◽  
V. F. PETRENKO ◽  
I. A. RYZHKIN ◽  
A. V. TRUKHANOV
Keyword(s):  
Experimental Study ◽  
Space Charge
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