OBSERVED KBETA ENERGY SHIFT IN CU AND NI

The characteristic Kβ x rays produced by 15.0-MeV oxygen (O4+) ions on Ni are found to shift in the spectrum by 112±15 eV relative to the energies produced by x-ray and proton excitation in Ni. Similarly, in Cu an energy shift of 97 ± 15 eV is observed. The observed shift is possibly due to the larger Kβ energies of the multiply ionized Ni or Cu produced in O4+ bombardments as opposed to the singly ionized Cu or Ni Kβ x rays. © 1969 The American Physical Society.