scholarly journals Atypical secondary electron emission yield curves of very thin SiO2 layers: Experiments and modeling

2021 ◽  
Vol 130 (13) ◽  
pp. 135305
Author(s):  
C. Rigoudy ◽  
K. Makasheva ◽  
M. Belhaj ◽  
S. Dadouch ◽  
G. Teyssedre ◽  
...  
Keyword(s):  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Yield Curves ◽  
Emission Yield

Application of WFS for Simultaneous Work Function and Secondary Electron Emission Measurement on Ba Covered Tungsten

2005 ◽  
Vol 473-474 ◽  
pp. 293-296
Author(s):  
György Vida ◽  
Ildikó Beck ◽  
V. Katalin Josepovits ◽  
Miklós Győr
Keyword(s):  
Work Function ◽  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Secondary Emission ◽  
Operating Conditions ◽  
Emission Measurement ◽  
Pressure Discharge ◽  
Emission Yield ◽  
Burning Voltage

In the present paper the secondary emission and work function of W covered with different thickness Ba layers are compared. The secondary emission and work function were measured by Work Function Spectroscopy (WFS). It is clearly pointed out that the thin Ba coating causes the the enhancement of electron induced secondary electron emission. In high pressure discharge lamps high secondary emission and high thermionic current are required for reliable operating conditions, i.e., for reaching the nominal burning voltage and current etc. The results prove that the Ba spreading on the W surface from an alkali earth tungstate material is advantageous for lowering the work function and, simultaneously, for increasing the secondary emission yield.

Secondary Electron Emission from Conductive, Liquid Polyethylene Glycol 1500

1976 ◽  
Vol 31 (1) ◽  
pp. 75-79
Author(s):  
K. Doblhofer ◽  
K. P. Charlé ◽  
D. Veltwisdi
Keyword(s):  
Polyethylene Glycol ◽  
Electron Emission ◽  
Secondary Electron ◽  
Elementary Theory ◽  
Secondary Electron Emission ◽  
Solid Polymer ◽  
Yield Curves ◽  
Conductive Liquid ◽  
Liquid Polymer ◽  
Polyethylene Glycol 1500

A thorough study of the secondary electron emission (SEE) yield from liquid Polyethylene glycol 1500 (PEG) was made. This liquid (m. p. 45 °C) has a low enough vapor pressure at a working temperature of about 50 °C. In addition, it has the advantage of being a good solvent for salts which dissociate and thus render the solutions conductive. It was found that the presence of the electrolyte salt does not affect the secondary electron yield curves.A striking result is that the yield curves obtained from the PEG solutions are very well reproducible (ca. ± 7%). By fitting the experimental data to a formula given by the elementary theory of SEE it can be clearly seen that this liquid polymer shows quite a different SEE behaviour compared with that reported for chemically similar solid polymer films. The results obtained agree well with the data for polymer silicon oils, suggesting that liquid polymers differ in their SEE behaviour from the corresponding solids.Finally, it is demonstrated that the reduced yield curves can be fitted to the physically meaningful Bethe loss formula at least as well as using the conventional approach.

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