A New Multi-ion Peak Selection System for the Respiratory Mass Spectrometer

The description of a simple multi-ion monitoring system newly developed for the respiratory mass spectrometer is presented. The system is composed of a selective step-wise scanning supply, a gate assembly which separate the sequential peaks to the respective channels and a timing unit. The central feature of the present system is that the step-wise potential itself and the gate pulses which controls the gate assembly are simultaneously originated from a common six fold ring counter. Each step of the scanning potential is produced by dividing the output of the ring counter by the corresponding series of resisters. The description of the component circuits and the overall performances of the system are presented and discussed with the intention of applying this system to the respiratory works.