D-region electron concentration profile produced by the July 9, 1962, nuclear detonation

1969 ◽  
Vol 74 (24) ◽  
pp. 5737-5742 ◽  
Author(s):  
A. T. Jusick ◽  
D. R. Furman
Keyword(s):  
Concentration Profile ◽  
Electron Concentration ◽  
D Region

Gleichzeitige Bestimmung von Parametern der Ionosphären-D-Region beim Vorliegen eines negativen Höhengradienten der Elektronenkonzentration

1981 ◽  
Vol 36 (5) ◽  
pp. 510-515
Author(s):  
W. Muschler
Keyword(s):  
Concentration Profile ◽  
Electron Concentration ◽  
Coupling Parameter ◽  
Electron Collision ◽  
Model Calculations ◽  
Electron Collision Frequency ◽  
Complex Wave ◽  
D Region ◽  
Propagation Experiment

Abstract Preceding papers were concerned with the principles of a wave propagation experiment, which appeared suitable for a simultaneous determination of electron concentration Ne and electron collision frequency v in a magnetoplasma. The complex wave polarization was used being defined by field strength ratios. In former model calculations the electron concentration profile was characterized by exclusively positive height gradients. In this paper considerations are extended to an electron concentration profile with gradient inversion. Calculations on error propagation and wave damping and an estimation of the coupling parameter do not lead to new or serious restrictions in the question of the applicability of the method.

Numerical investigation of tunnelling contributions to electron scavenging reactions in liquids at short times

1977 ◽  
Vol 55 (11) ◽  
pp. 2124-2132 ◽  
Author(s):  
P. Robin Butler ◽  
Michael J. Pilling ◽  
Stephen A. Rice ◽  
Timothy J. Stone
Keyword(s):  
Diffusion Equation ◽  
Time Dependence ◽  
Numerical Investigation ◽  
Concentration Profile ◽  
Electron Concentration ◽  
Significant Contribution ◽  
Reaction Parameters ◽  
Sink Term ◽  
Short Time ◽  
Short Times

Fick's second diffusion equation, with an added exponential sink term, is integrated numerically to simulate the decay of electrons at short times in the presence of scavengers. The time dependence of the scavenger concentration profile, the scavenging rate constant, and the electron concentration are illustrated graphically. Using the experimental results of Buxton et al. and Jonah et al. It is shown that the Smoluchowski equation is valid within their experimental time ranges provided the cage encounter distance is replaced by Reff, where Reff can be evaluated explicitly in terms of reaction parameters. It is also shown that tunnelling from relaxed traps may make a significant contribution to ultra-short time electron scavenging.

Results of electron-concentration measurements in the D-region of the ionosphere during ionospheric disturbances

1975 ◽  
Vol 18 (8) ◽  
pp. 806-809
Author(s):  
V. V. Belikovich ◽  
E. A. Benediktov ◽  
L. V. Grishkevich ◽  
V. A. Ivanov
Keyword(s):  
Electron Concentration ◽  
Ionospheric Disturbances ◽  
D Region ◽  
Concentration Measurements

Über ein Verfahren zur gleichzeitigen Bestimmung von Elektronenkonzentration und Elektronenstoßzahl in einem homogenen isotropen oder in einem langsam veränderlichen Plasma

1970 ◽  
Vol 25 (1) ◽  
pp. 106-114
Author(s):  
W. Muschler
Keyword(s):  
Refractive Index ◽  
Electron Concentration ◽  
Collision Frequency ◽  
Complex Refractive Index ◽  
Electron Collision ◽  
Height Range ◽  
Reflected Waves ◽  
Electron Collision Frequency ◽  
D Region

Abstract A method is described, which allows determination of the complex refractive index of a plasma by separate measurement of the E-and H-component of an electromagnetic wave. By means of the complex refractive index simultaneously electron concentration and electron collision frequency of the medium can be stated.The measuring frequency depends upon absorption, precision requirements, and - for a locally varying medium - upon the availability range of theory used.General considerations are applied to a plasma model (terrestrial ionosphere without magnetic field): Simultaneous measurement of electron concentration and electron collision frequency should be well possible within a height range corresponding to the terrestrial D-region. In higher regions determination of the (decreasing) electron collision frequency becomes more and more difficult, whereas possibilities for determination of the (increasing) electron concentration seem to improve.The influence of reflected waves is considered in a following paper 4.

Si implants into Preamorphised GaAs

1987 ◽  
Vol 92 ◽  
Author(s):  
R. Gwilliam ◽  
R.S. Deol ◽  
R. Blunt ◽  
B.J. Sealy
Keyword(s):  
Electrical Properties ◽  
Concentration Profile ◽  
Electron Concentration ◽  
Marked Effect ◽  
Good Control ◽  
Amorphous Layer ◽  
Electrical Activation ◽  
Rapid Thermal Anneal

ABSTRACTDual implants of (P+ + Si+) through thin Si3N4, layers have been studied. The phosphorus dose has a marked effect on the electrical properties of 6 × 1012 Si+ cm−2. Optimum electrical activation occurred at a phosphorus dose well below that required to produce an amorphous layer and depended on whether a furnace or a rapid thermal anneal was performed. Good control over the tail of the electron concentration profile was obtained for doses of phosphorus in the range 6 × 1012 to 1 × 1014 ions cm−2.

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