High-resolution measurement of Fe Kα x rays produced by MeV/amu iodine ions

Using a high-resolution Bragg spectrometer equipped with a LiF crystal, the authors have measured the Kα x rays of Fe produced by incident I127 projectiles of energy 100 and 167 MeV. Distinct satellite structure corresponding to K x-ray emission in the presence of multiple L vacancies was resolved. The observed spectra consisted of six major components, from which it is concluded that initial L1 vacancies transfer before x-ray emission via fast 2s→2p Coster-Kronig transitions. The authors have determined the energy, width, and intensity of the individual satellite peaks, and find that the number of M vacancies increases with L vacancies and that the degree of M-shell ionization is greater at the lower beam energy. Relative ionization intensities were determined by taking into account the effects of L-shell rearrangement prior to K-x-ray emission. It is found that these intensities are reasonably well represented by a binomial distribution giving ionization probabilities pL of 0.41 and 0.44 at 100 and 167 MeV, respectively.