With the aid of a diagram, describe the operation of Bainbridge mass spectrometer in the determination of charge to mass ratio. 

With the aid of a diagram, describe the operation of Bainbridge mass spectrometer in the determination of charge to mass ratio.

T₁ and T₂ are tracers on photographic plate, S₁, S₂ and S₃ are slits

Mode of action

• Positive ions are produced in a discharge tube and admitted as a beam through slits S₁ and S₂.
• The beam then passes between insulated plates P, Q, connected to a battery, which create an electric field of intensity E.
• A uniform magnetic field B₁, perpendicular to E is applied over the region of the plates and all ions, charge e with the same velocity, v given by B₁ev =Ee will then pass undeflected through the plates and through a slit S₃.
• The selected ions are deflected in a circular path of radius r by a uniform perpendicular magnetic field B₂ and an image is produced on a photographic plate as shown.

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