Single Elementary Particle at Rest in Space (SEPARIS) III   (Physics)
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The electron is an elementary particle that may be isolated,            brought to rest in free space, and studied with extreme                         precision.  It is proposed to re-measure the fundamental                        properties of the electron and its antiparticle, the positron, to               the highest accuracy.  To this end, the stationary "geonium" atom               is synthesized from an individual electron, the homogeneous field               of a superconducting magnet, and a weak electric quadrupole                     field.  On this atom, the spin, cyclotron, axial and magnetron                  frequencies are measured.  Such measurements constitute                         significant tests of QED and the CPT theorem.  Hadronic                         admixtures will become observable.  The geonium spectra yield the               most precise (QED) value for the fine structure constant, alpha,                to date and may soon give a non-QED value for alpha.
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