Energy Shift of Characteristic X Rays Induced in Collisions Between 15- to 60-MeV I Ions and Mo, Yb, and Au Targets

X rays emitted in collisions between heavy atomic particles were analyzed with a highly resolving Si(Li) detector. $L$ and $M$ x-ray spectra are shown for the collision systems $\mathrm{I}\to \mathrm{M}\mathrm{o},\mathrm{Y}\mathrm{b},\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{A}\mathrm{u}$ at 17.6-, 34.0- and 57.0-MeV ion energy. The $L$ x rays of both colliding particles are shifted to higher energies compared with photon-induced characteristic x rays.