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algebrageek
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Ionisation
- Electron gun fires high enery electrons
- Hit atoms, knock off electrons
- Form positive ions
- Very few have two electrons knocked off (2+ ions)
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Acceleration
- Negative plates with small gap
- Attract ions, so they accelerate
- Most hit plates- back to atoms
- Others form narrow beam of positive ions
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Deflection
- Electromagnet- change strength
- Deflects ions (bends beam)
- Lighter ions deflected further than heavier ions
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Detection
- Ion hits plate
- Positive charge creates smal pulse of electrical current
- Larger current means higher abudance
- Same mass is same point on plate
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