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 A STUDY OF THE INTRODUCTION O F IONS INTO THE REGION OF STRONG FIELDS WITHIN A QUADRUPOLE MASS SPECTROMETER Wilson M. Brubaker ABSTRACT Experiments with the round and the hyperbolic quadrupole units The preliminary data which were obtained pre- The resolving power of the hyper- have been continued, viously have been substantiated. bolic quadrupole 1s about twice that of the round at comparable sensltivitieg, Resolving power of 600, measured a t the 10 peak height, was obtained with the hyperbolic unit at a transmission efficiency of 20%, when excited at very low power, a resolving power of 1000 was obtained a t 10% transmission efficiency, Flat-topped peaks were observed at resolving powers below 400. A t higher power,

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