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Sample is vaporised and placed into the mass spectrometer

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by

Matt Cannon

on 9 December 2013

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Transcript of Sample is vaporised and placed into the mass spectrometer

Sample is vaporised and placed into the mass spectrometer
Once in it is in it is
ionised

This is done by firing electrons at high speed at the sample causing ions of the initial sample to be formed
M + e
+
-
M
+ 2e
-
The electrons though can also cause splitting, the sample can break down into smaller fragments of the original molecule
M + e F + N*

+
-
F is the fragment ion formed
N* is a neutral ion ormed
+
(g)
(g)
(g)
(g)
(g)
The positive ions can then be accelerated by magnets (due to their charge)
The magnet causes the ions to turn round the corner, however..........
If the ions are to light they will be affected to much by the magnet and not turn the corner
Or they may be too heavy in which case the magnet won't be able to change heir course and they will again not get round the corner
Ions that are the right mass (and charge) will get turned by the magnet around the corner and make it to the detector
The detector records how strong the magnet is and how many ions get round the corner. It can then plot these results on a graph
The magnet is thn increased in strength and the detector will see if any ions have the right mass to get round the corner.

These results are plotted onto a graph
M
+
peak
Mass Spectrometry
Full transcript