An automatic version of the R.P.D. method has been developed for obtaining digital ionization curves of secondary ions by using counting techniques and a multichannel analyzer. The application of an indirectly heated sintered Nickel cathode yielded ca. 40% of the total electron current within an energy range of 0.1 eV. The R.P.D. ion source in connection with the automation circuit and a conventional mass spectrometer were used to investigate the formation of KrD
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