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1963 by McGraw-Hill A. O. Nier accelerating voltage altitude amplifier amplitude analyzer angle atmosphere Bennett C. A. McDowell circuit constant current efficiency cycle cycloid deflection detected detector dispersion double-focusing dynodes edited by C. A. elec electric and magnetic electric field electrometer electron multiplier electrostatic analyzer energy gain entrance equation experimental filament focusing frequency gases given grid initial instrument ion beam ion current ion source ionization ionization gauge ionosphere ions of mass magnetic field mass number mass spec mass spectrograph Mass Spectroscopy mass spectrum maximum measured molecules Narcisi negative ions nitric oxide nitrogen obtained oscilloscope path plate positive ions positive-ion potential pressure pulse radial electrostatic radio-frequency radius ratio reach the collector region resolution resolving power retarding RF mass spectrometer RF voltage rocket satellite sector sensitivity shown in Fig slit space spectra spectrometer tube stage time-of-flight mass spectrometer tion transit trometer trons velocity voltage width