1 / 12

Mass Spectrometry

Mass Spectrometry. Chapters 11 and 20. Time of Flight Equation. Quadrupole. Quadrupole. AC voltage (R.F.) When field (-), ions attr . to rods When field (+), ions pushed to center – more difficult to deflect heavy ions w/ AC voltage.

marlee
Télécharger la présentation

Mass Spectrometry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mass Spectrometry Chapters 11 and 20

  2. Time of Flight Equation

  3. Quadrupole

  4. Quadrupole AC voltage (R.F.) • When field (-), ions attr. to rods • When field (+), ions pushed to center – more difficult to deflect heavy ions w/ AC voltage

  5. R.F. (ac voltage) only – quadrupoleis a high mass filter - R.F. has big influence on small mass - R.F. has little influence on large mass

  6. Quadrupole DC voltage (+) rods • Keep ions in center • Lighter ions can still hit rods on (-) part of AC voltage (-) rods • All ions drawn toward rods • Lighter ions can have (+) part of AC voltage repel them enough so they don’t hit rods High mass filter Low mass filter

  7. Detector: Electron Multipliers

  8. Best accuracy: Sector and FT-ICR Best resolution: FT-ICR Largest m/z range: TOF

More Related