Formula: Mass Spectrometer Mass    Electric charge    Radius of the circular path    Plate distance    Voltage    Magnetic flux density (B-field)

Formula: Mass Spectrometer
Basic Setup of a Mass Spectrometer


Mass of the charged particle exiting behind the aperture of the mass spectrometer.

Electric charge

Charge of a particle shot into the mass spectrometer.

Radius of the circular path

Radius of the semicircular orbit of the particle created behind the aperture.

Plate distance

Distance between the two electrodes of the capacitor.


Voltage between the capacitor plates.

Magnetic flux density (B-field)

External magnetic field in which the plate capacitor is placed. This magnetic field is also outside the capacitor behind the aperture. This field is responsible for the charge to perform a circular motion.

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