Mass Spectrometer
- Created by: Jasmin
- Created on: 02-11-13 14:29
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- Mass Spectrometer
- Used for accurate determination of relative atomic, molecular mass
- 1. Sample is vapourised
- Gases, liquids and volatile solids injected directly and vaporised under high vacuum
- 2. Positive ions formed from vapour
- In ionisation chamber, high energy electrons bombard the atoms/molecules in the vapour
- 1 or 2 electrons knocked out of each atom after collision
- In ionisation chamber, high energy electrons bombard the atoms/molecules in the vapour
- 3. Positive ions accelerated out of ionisation chamber
- By applying high pd across region of apparatus
- 4. Ions are deflected by magnetic field
- According to their mass and charge
- Greater the mass, less charge, smaller deflection
- Lower the mass, higher charge, greater deflection
- According to their mass and charge
- 5. Ions are detected and record made
- Positive ions strike the detector
- Causes current to flow in detector circuit linked to recorder or computer
- Height of peaks are directly proportional to relative abundance of isotopes
- Causes current to flow in detector circuit linked to recorder or computer
- Positive ions strike the detector
- Uses
- Detection of drugs in urine sample
- Pharmaceutical industry
- Provide an identifier for compounds synthesised for possible identification as drugs
- Chloroethane
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