High-resolution measurement of FeKαx rays produced by MeV/amu iodine ions

Abstract

Using a high-resolution Bragg spectrometer equipped with a LiF crystal, the authors have measured the $K\ensuremath{\alpha}$ x rays of Fe produced by incident $^{127}\mathrm{I}$ 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 ${L}_{1}$ vacancies transfer before x-ray emission via fast $2s\ensuremath{\rightarrow}2p$ 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 ${p}_{L}$ of 0.41 and 0.44 at 100 and 167 MeV, respectively.