Photoelectric effects in x-ray preionization for excimer laser gases


Azarov, A.V. and Peters, P.J.M. and Boller, K.-J. (2008) Photoelectric effects in x-ray preionization for excimer laser gases. Journal of Applied Physics, 103 (4). 043301. ISSN 0021-8979

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Abstract: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.
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Copyright:© 2008 American Institute of Physics
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