Secondary Electron Emission from Conductive, Liquid Polyethylene Glycol 1500

K. Doblhofer 1 , K. P. Charlé 1  and D. Veltwisdi 1
  • 1 Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-1000 Berlin-Dahlem, Germany

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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