AQA A LEVEL CHEMISTRY PAPER 1 Frequently Most Tested Questions and Verified Accurate Answers
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Course
AQA
Institution
AQA
TOF steps
1) ionisation
2) acceleration
3) ion drift
4) detection
5) analysis
Electron impact
Sample vaporised and electron gun fires high energy electrons at it which knock off 1
electron from each particle, making them 1+ ions
NB- can knock off more than one e or break molecular...
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AQA A LEVEL CHEMISTRY PAPER 1
Frequently Most Tested Questions and
Verified Accurate Answers
TOF steps
✓ 1) ionisation
✓ 2) acceleration
✓ 3) ion drift
✓ 4) detection
✓ 5) analysis
Electron impact
✓ Sample vaporised and electron gun fires high energy electrons at it which knock off 1
electron from each particle, making them 1+ ions
✓ NB- can knock off more than one e or break molecular ion
electrospray ionization
✓ Sample dissolved in volatile solvent then injected through needle to give fine mist which is
attached to positive end of high voltage power supply, particles gain proton
✓ NB- Mr of substance is actually one less than shown due to extra H+
Acceleration (TOF)
✓ positive ions accelerated using electric field so they all have the same kinetic energy
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