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- W6287485 abstract "Mechanisms for the produciion of positive ions on metallic and nonmetallic surfaces were investigated. In order to determine the mass spectrum of the emission from a particular source, a magnetic-sector-field mass spectrometer was constructed. This instrument is a firstorder-focusing type, having a 60 deg -sector magnetic field in which the ion trajectories have a 5-in. radius of curvature. The spectrometer is constructed entirely of metal, with the central portion of the tube forming the pole faces of the magnet. which has high- impedance windings. The magnetcurrent power supply, regulated to I part in 10/ sup 4/, is capable of generating fields greater than 16.000 gauss in the focusing region. The precision accelerating voltage is also regulated to 1 part in 10/sup 4/ up to 15 kv at 10 ma. The system is evacuated by a 6-in. oil-diffusion pump which is well trapped with liquid nitrogen: pressures throughout the system are of the order of 10/sup -6/mm Hg. The instrument was designed primarily to investigate the mass spectrum of ions produced thermally on surfaces. Since such sources usually evolve neutral gases at high rates, the spectrometer is pumped from the source end through a 3-in.-ID coupling adjacent to the ion source.more » Positive-ion masses in the range from 6 to 184 amu and negative ions with masses of about 150 amu were studied with this instrument. The resolving power of the system is approximately 200 for thermally prcduced positive ions. (auth)« less" @default.
- W6287485 created "2016-06-24" @default.
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- W6287485 date "1960-06-01" @default.
- W6287485 modified "2023-09-27" @default.
- W6287485 title "THE DEVELOPMENT OF A MASS SPECTROMETER FOR ION STUDIES" @default.
- W6287485 hasPublicationYear "1960" @default.
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