Accessing select properties of the electron with ImageJ: an open-source image-processing paradigm

This paper describes a way to measure the radii of curvature of electrons following a curved path in a magnetic field and the radii of the concentric rings resulting from the interference of the electrons inside an evacuated diffraction tube. High-resolution imaging dramatically increases the precision of measurements of physical distances, if they are along circular arcs. Digital photographs were taken and the free software ImageJ that comes with a multitude of image-processing routines and is widely used in life sciences research was employed for measurement and analysis.