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1. Ionisation
The gaseous sample is turned into positive ions
using a high kinetic energy gun.
X(g) + e ¯ X+ 2e¯
A small amount of 2 ions are sometimes created
X(g) + e¯ X 2…read more

Slide 3

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2. Acceleration
The positive ions are accelerated using an
electric field.…read more

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3. Deflection
The ions are deflected by a powerful magnetic
field.
The amount of deflection depends on:
1. The mass of the ion ­ the lighter ions get
deflected more
2. The charge on the ion ­ the small amount of
2+ ions are deflected more
These combined together give the m/z ratio…read more

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4. Detection
1. Ions hit the detector and pick up electrons
2. This creates a current
3. The size of the current is proportional to the
abundance of the ion…read more

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Calculations
Relative atomic mass =
average mass of an atom X 12
mass of one atom of C12
This can be calculated by:
(m/z x relative abundance)
(relative abundances)…read more

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