Analytical Instrument Documents

JEOL Resources

rss

Documentation in support of your JEOL product.

About Magnetic Sector Mass Spectrometers

A double-focusing magnetic sector mass spectrometer has at least four components:

  • An ion source in which ions are formed and accelerated to energies of up to as high as 10 kilovolts.
  • A magnetic sector with a magnetic field that exerts a force perpendicular to the ion motion to deflect ions according to their momentum.
  • An electric sector with an electric field that exerts a force perpendicular to the ion motion to deflect ions according to their kinetic energy.
  • A detector that produces a response that is proportional to the number of ions.

Slits are placed in the ion path to define the positions and energies of the ions that strike the detector. In general, decreasing the slit widths increases the mass resolution but reduces the number of ions that are detected. Additional electrostatic lenses are commonly used to shape and deflect the ion beam to optimize peak shape and maximize ion beam transmission from the source to the detector. JEOL uses octapole and quadrupole focusing lenses to simplify the ion optical design.

Collision chambers in the first field-free region (just after the ion source) and second field-free region (just after the magnet and before the electric sector) are used to induce ions to fragment in collision-induced-dissociation experiments (MS/MS).

Attached Files
Showing 0 Comment


Comments are closed.

Other Resources

Image Gallery
  • View a selection of NMR and MS spectra
  • Walkup NMR
  • See how the Delta NMR software allows users to just "walk up" and start NMR experiments
  • Mass Spec Reference Data
  • View our page of useful molecular references for Mass Spec
  • Tutorials (Mass Spec)
  • Documents on the basics of mass spectrometry
  • Delta NMR software Tutorials
  • Videos on how to use the Delta NMR software
  • No-D NMR
  • Description of No-D NMR and how it can be used to eliminate the need for deuterated solvents
  • Non Uniform Sampling (NUS)
  • Description of how NUS is used to greatly reduce the time needed for running NMR experiments
  • NMR Basics
  • Overview of the Basics of NMR Theory
  • NMR Magnet Destruction
  • See our presentation of the slicing open of a JEOL Delta-GSX 270 MHz NMR Magnet
  • Media

    Corona - Glow Discharge (DART Ion Source)

    January 28, 2022
    2652
      JEOL USA, Inc.
      11 Dearborn Road
      Peabody, MA 01960
      © Copyright 2022 by JEOL USA, Inc.
      Terms of Use
      |
      Privacy Policy
      |
      Cookie Preferences