A microcomputerhyphen;based control system for a dualhyphen;output Channeltron (TM) detector has been developed and implemented. This system is capable of collecting ion current and ionhyphen;counting information simultaneously. Ion current and ionhyphen;counting data are scaled in software and provide consistent ion intensity values from both outputs. Calculation of the ion current/ion count rate ratio at each peak in the mass spectrum allows the system to compensate for variations in gain from peak to peak. The data collection system maximizes the data collection rate and extends the useful dynamic range of electron multiplierhyphen;based detection to nine orders of magnitude with no change in any of the multiplier conditions. Measurement of such a wide range of ion intensities in a single spectrum is particularly useful for applications in tandem mass spectrometry.
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