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Metastable states in gases with lives over 24 hours

  • Dj. A. Bošan
  • M. M. Pejović
  • M. V. Vujović
Vacuum Physics Invited Papers

Abstract

These investigations were conducted in order to study the behaviour and lifetime of metastables in various vapours and gases including noble gases as well as H2 and N2. Metastables were detected by time delay measurements of electrical breakdown in gases (this being caused by secondary emission from the deexcitation of metastables at the cathode.) It was confirmed that metastable states at pressures smaller than 1 bar deexcite exponentially with a half-life of 50 min and under certain conditions even an order of magnitude longer. The decrease of lifetime with the increase of pressure was also confirmed. A sharp dependence of the concentration of metastables on electrode temperatures was discovered. Transport phenomena of metastables through several meter long glass tubes were observed as well as deexcitation by illumination. New data were obtained on the dependence of breakdown time delays and correspondingly on concentrations of metastables on the type and pressure of the gas filling, shapes and materials of electrodes, overvoltages, gas flow rates, temperatures, etc. *** DIRECT SUPPORT *** A02PS156 00002

Keywords

Metastable State Electrical Breakdown Secondary Emission Secondary Electron Emission Contribute Paper 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© with the authors 1980

Authors and Affiliations

  • Dj. A. Bošan
    • 1
  • M. M. Pejović
    • 1
  • M. V. Vujović
    • 2
  1. 1.Faculty of electronic engineeringNišYugoslavia
  2. 2.Boris Kidrich Institute of Nuclear sciencesBeogradYugoslavia

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