mass spectrometry
- Created by: Margaret Hobart
- Created on: 21-04-21 17:30
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- mass spectrometry
- determines relative molecular mass
- gives data on relative isotopic abundance and relative isotopic mass
- isotopes
- same number of protons different number of neutrons
- isotopes
- calculate relative atomic mass
- using masses and abundance's fro each isotope
- for identifying elements
- Time of flight (TOF)
- 1.ionisation
- electrospray: a sample is dissolved and pushed through at high pressure. a high voltage causes each particle to gain H+. sample turned into gas made of positive ions
- electron impact: the sample is vaporised and an electron gun is used to fire high energy electrons at it. this knocks one electron off each particle, so they become +1 ions
- 2.acceleration
- positively charged ions are accelerated by an electric field so they have the same KE.
- 3. flight tube (ion drift)
- ions enter no electric field area so they drift. lighter ions drift through faster
- 4. detection
- the detector detects charged particles and a mass spectrum is produced
- 1.ionisation
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