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Figure 4: Arrangement of the electrostatic and magnetic sectors in the Mattauch-Herzog double-focusing mass spectrometer. The ions are deflected in opposite directions in the electrostatic and magnetic fields. The divergent monoenergetic beam contains two ion species of different mass-to-charge ratio. All ions are brought to a focus along the plane AB. Figure 5: Arrangement of the electrostatic and magnetic sectors in the Nier double-focusing mass spectrometer. The angle of the electrostatic sector is 90° and that of the magnetic sector 60°. The direction of deflection of the ion beam is the same in both sectors. Figure 6: Schematic diagram of a quadrupole mass spectrometer. The pairs of opposing electrodes are electrically connected to a balanced voltage source having a radio frequency component superimposed on a constant potential. Combinations of values for the amplitude and frequency exist that allow ions of a given mass from a beam of constant energy to emerge undeflected.
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mass spectroscope

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mass spectrometry

  • Figure 1: An electron bombardment ion source in cross section. An electron beam is drawn from the filament and accelerated across the region in which the ions are formed and toward the electron trap. An electric field produced by the repeller forces the ion beam from the source through the exit slit.
    In mass spectrometry

    …other nonelectrical means; the term mass spectroscope is used to include both kinds of devices. Since electrical detectors are now most commonly used, the field is typically referred to as mass spectrometry.

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