3.1.1.2 Mass Number And Isotopes
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What is isotopic abundance?
It determines how much of each isotope there is
What are the stages of a time of flight mass spectrometer?
Vacuum: apparatus kept in a vacuum, prevents ions colliding with air Ionisation: sample dissolved in volatile substance, droplets lose electrons to become ions Acceleration: ions are drawn to negative plate, lighter ions move faster Ion drift: ions pass along flight tube Detection: lighter ions reach detector first, positive ions pick up an electron which causes a current to flow Data analysis: signal creates a mass spectrum
How do you work out molecular peaks?
Write down every possible combination of atoms
What is the difference between high and low mass spectrometry?
High: 5 decimal places Low: 1 decimal place
How can mass spectrometry be used to find the relative molecular mass of a molecule?
The peak with the largest m/z value is the molecular ion peak It’s m/z value is equal to the relative molecular mass of the molecule
How is abundance measured in a TOF mass spectrometer?
Ions are detected by gaining electrons The abundance is determined by the size of the current