Photodetachment effect in a radio frequency plasma in CF4

J.L. Jauberteau, G.J. Meeusen, M. Haverlag, G.M.W. Kroesen, F.J. Hoog, de

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Experiments to study negative ion densities have been carried out using the photodetachment effect in a rf plasma in CF4. Electrons are detached from the negative ions under the influence of the pulse of a Nd:YAG laser. The induced increase of the electron density is measured as a function of time using the shift of the resonance frequency of a microwave cavity containing the plasma. The negative ion density [F-] is found to be about (4±1)×1015 m-3, a factor 4±1 higher than the electron density.
Original languageEnglish
Pages (from-to)2597-2599
JournalApplied Physics Letters
Issue number25
Publication statusPublished - 1989


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