Photo-electric effects in X-ray preionization for excimer laser gases

A.V. Azarov, P.J.M. Peters, Klaus J. Boller

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We present detailed measurements on the x-ray preionization electron density in a discharge chamber filled with different gases relevant to discharge pumped high-pressure excimer lasers. By comparing experimental results with the theoretical electron densities, we conclude that the observed preionization is inconsistent with the standard picture of direct ionization through x-ray absorption in the gas. We conclude that depending on the gas pressure, type of gas, and the gap length between the discharge electrodes used, x-ray preionization in excimer gases is, to a significant extent or even dominantly, based on a different mechanism. We identify that this mechanism is based on fast photoelectrons emitted by the cathode into the discharge chamber.
Original languageUndefined
Pages (from-to)043301-1-043301-9
Number of pages10
JournalJournal of Applied Physics
Issue number4
Publication statusPublished - 2008


  • IR-59962
  • METIS-247109

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