An Upper Limit for Atomic Orbital Electron Ejection AccompanyingK-Capture inFe55

An upper limit has been determined for the number of atomic orbital electrons ejected during the decay of ${\mathrm{Fe}}^{55}$ by orbital capture. From cloud-chamber observations it is concluded that less than 0.6×${10}^{-6\mathrm{}}$ electron are ejected per disintegration with energies in the range 30 kev to 205 kev. The theoretical prediction gives the order of ${10}^{-6\mathrm{}}$ electron per disintegration for the frequency of the process in the energy range studied.