Practice Model of a Bainbridge Mass Spectrometer A Wien filter velocity-selector allows to isolate particles with a specific velocity of a particle beam. To investigate the mass of the particles the experimental setup must be extended. A simple setup to examine the mass of particles is the Bainbridge Mass Spectrometer. Setup: In the extended setup the magnetic field does not end on the aperture.
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Engineering Physics by Dr. Amita Maurya, Peoples University, Bhopal. Principle Uniform magnetic field acting normal to the path of ions having same velocity deflects the ions of different masses from a straight path to circular path of different radii, Construction i Ionization Chamber Ionization chamber is used to ionize the gas whose mass or isotope is to be determined and positive ions are produced.
A potential V is applied between two electrodes to produce the electric field. A magnetic field strength B is applied at right angles to the electrostatic field and so the electrostatic and electromagnetic forces act in opposite directions to each other. Working Ions are formed in ionization chamber and pass through the cathode, then through collimating slits S1 and S2. The beam is then passed through velocity selector in which electric and magnetic fields are applied perpendicular to each other.
The ion moves in straight line path for which both the forces acting on it are equal The velocity of ion which passes undeflected through the velocity selector is If the mass of an ion is M, its charge q and its velocity v then or The radius of the path in the deflection chamber is directly proportional to the mass of the ion. The detection is done by photographic plate when the ions fall on it.
Note the wider line for the mass m1, showing its relatively greater abundance. Linear separation This method of analysis is very accurate and can detect differences in the masses of two ions as small as one part in If M1 and M2 are the masses of two isotopes and if x1 and x2 are the distances from S3.
The linear separation using equation 3.
Model of a Bainbridge Mass Spectrometer
Sector mass spectrometer