Main Page/PHYS 4210/Mass Spectrometer

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Mass Spectrometer

The mass spectrometer is a device that separates and identifies ions according to their mass-to-charge ratio using the linear acceleration and deflection of ions, in electric and magnetic fields respectively.

Mspec-fig1.png

Figure 1 - Schematic diagram of the magnetic selector mass spectrometer.

Key Concepts

  • Charge-to-mass ratio
  • A/D Converter
  • Mean free path
  • Faraday Cup
  • Diffusion pump
  • magnetic selector
  • Roughing pump
  • Ion gauge
  • Thermocouple gauge

Pre-Lab Requirement

This experiment has a prelab component. You must complete this exercise before you meet the TA for a demonstration.

Prepare a table of showing at which accelerating voltage you would expect to see a signal for the isotopes listed in the table below. Provide these for various values of magnetic field between 0.1T and 0.3T.

For example:

0.1 T0.12 T 0.14 T ...
1H
4He
6Li
7Li
...
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