Electrical conductivity in alkali halides induced by electron bombardment

1964 ◽  
Vol 15 (7) ◽  
pp. 797-800 ◽  
Author(s):  
P R Collings ◽  
J Hirsch
Keyword(s):  
Electrical Conductivity ◽  
Alkali Halides ◽  
Electron Bombardment

Excited-Atom Production by Electron Bombardment of Alkali-Halides

1986 ◽  
Vol 75 ◽  
Author(s):  
R. E. Walkup ◽  
Ph. Avouris ◽  
A. P. Ghosh
Keyword(s):  
Gas Phase ◽  
Excited States ◽  
Ground State ◽  
Excited Atom ◽  
Alkali Halides ◽  
Electron Bombardment ◽  
Secondary Electrons ◽  
Excited Atoms ◽  
Positive Ions ◽  
Electronically Excited

AbstractWe present experimental results which suggest a new mechanism for the production of excited atoms and ions by electron bombardment of alkali-halides. Doppler shift measurements show that the electronically excited atoms have a thermal velocity distribution in equilibrium with the surface temperature. Measurements of the absolute yield of excited atoms, the distribution of population among the excited states, and the dependence of yield on incident electron current support a model in which excited atoms are produced by gas-phase collisions between desorbed ground-state atoms and secondary electrons. Similarly, gas-phase ionization of ground-state neutrals by secondary electrons accounts for a substantial portion of the positive ions produced by electron bombardment of alkali-halides.

Premelting electrical conductivity and heat capacity in some alkali halides

1978 ◽  
Vol 82 (11) ◽  
pp. 1277-1287 ◽  
Author(s):  
J. L. Tallon ◽  
W. H. Robinson ◽  
S. I. Smedley
Keyword(s):  
Electrical Conductivity ◽  
Heat Capacity ◽  
Alkali Halides

High Temperature Dielectric Breakdown of Alkali Halides

1960 ◽  
Vol 13 (2) ◽  
pp. 270 ◽  
Author(s):  
JJ O'Dwyer
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Experimental Work ◽  
Temperature Region ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Alkali Halides ◽  
Thermal Breakdown ◽  
High Temperature Region ◽  
The Difference

In the high temperature region much of the experimental work on the dielectric breakdown of the alkali halides is apparently conflicting. If, however, it is assumed that, breakdown is thermal in nature instead of intrinsic, reasons can be given which reduce the difference between various sets of existing experimental results. A calcula� t,ion of the thermal breakdown strength is given based on the assumption that the electrical conductivity is principally ionic. The magnitude and temperature variation of the breakdown strength is given correctly without disposable constants. Some suggestions are given for experimental work which may clear up outstanding difficulties.

Excited-Atom Production by Electron Bombardment of Alkali Halides

1986 ◽  
Vol 57 (17) ◽  
pp. 2227-2230 ◽  
Author(s):  
R. E. Walkup ◽  
Ph. Avouris ◽  
A. P. Ghosh
Keyword(s):  
Excited Atom ◽  
Alkali Halides ◽  
Electron Bombardment

STUDY OF IONIC CRYSTALS UNDER ELECTRON BOMBARDMENT

1951 ◽  
Vol 29 (2) ◽  
pp. 122-128 ◽  
Author(s):  
D. E. McLennan
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Electron Diffraction ◽  
Crystal Lattice ◽  
High Intensity ◽  
Alkali Halides ◽  
Electron Bombardment ◽  
High Electron ◽  
Ionic Crystals ◽  
Small Crystals

Electron bombardment experiments have been carried out on small crystals of the alkali halides within the electron microscope. Crystals of two size ranges were bombarded at high intensity, and evidence of a generalized photographic effect within the ionic group of solids is presented. The first group of crystal specimens ranged in size from 0.2 to 0.002 cm., the bombardment causing the formation of F-centers and entrapped metal colloids in the crystal lattice. Ionization pulses were observed to occur in the region of the specimen during bombardment. The second group ranged in size from 10 to 0.01 μ, observations on the effects of bombardment being carried out with electron diffraction techniques. A process has been suggested to explain the phenomenon of ionic crystals which appear to lose their centers under high electron beam intensity in the electron microscope.

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