Experimental Inner-Electron Binding Energies inFm100and Limits on Electrodynamic Nonlinearities

Abstract
Our earlier experimental value for the 1s binding energy in Fm100 (141.967±0.013 keV) agrees with a precision relativistic Hartree-Fock calculation using linear electrodynamics to 2±35 eV. This result is compared with a recent approximate calculation of the reduction (3.3 keV) in this binding energy when Born-Infeld nonlinear electrodynamics is used, and it indicates that such nonlinearities are limited to the order of 1% of Born-Infeld theory.