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- W135058809 abstract "A mass spectrometer using an electric-quadrupole mass filter has been designed and built to cover 1 to 400 amu in four ranges. The r-f drive voltages for the quadrupole filter are obtained from a Class C amplifier with feedbackcontrolled modulation. The d-c voltages are obtained from feedback- controlled amplifiers. Provisions are made for rapidly sweeping the mass range by changing the r-f and d-c voltages and for oscillographic presentation of the spectra. It is found that a suitable relation between applied r-f and d-c voltages can make spectral line widths and filter transmission independent of mass. Apparatus built, but not yet completely operational, will produce a single output pulse of standard size for each ion incident on the electron-multiplier ion detector; integration of these pulses gives a current proportional to the rate of ion impacts but independent of electron-multiplier gain fluctuations. The spectrometer is found to have a maximum resolution of about 700; maximum resolution at unity transmission is about 30. The lowest pressure it can detect at present is about 10/sup -10/ torr. There is a fine structure on the peaks of the mass spectrum that is dependent upon the transverse momentum of the ions entering the quadrupole. (auth)" @default.
- W135058809 created "2016-06-24" @default.
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- W135058809 date "1963-01-01" @default.
- W135058809 modified "2023-09-24" @default.
- W135058809 title "DESIGN OF A QUADRUPOLE MASS SPECTROMETER. Technical Report 176" @default.
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