Gaseous sample of substance is bombarded with high energy electrons.This results in the removal of electron(s) to create a positive ion.
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Describe Acceleration.
Ion are accelerated by an electric field- they enter a magnetic field.
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Describe Deflection.
Magnetic field deflected the ions. Degree of deflection depends on mass of ion. Ions with greatest mass are deflected least.So,ions are separated according to mass.
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Describe Detection.
At detector, positive ion accepts an electron and causes a current to flow. Current is proportional to relative abundance of the ion.
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