  We demonstrate the controlled creation of a $\mathrm{^{174}Yb^{2+}}$ ion by
photo-ionizing $\mathrm{^{174}Yb^+}$ with weak continuous-wave lasers at
ultraviolet wavelengths. The photo-ionization is performed by resonantly
exciting transitions of the $\mathrm{^{174}Yb^+}$ ion in three steps. Starting
from an ion crystal of two laser-cooled $\mathrm{^{174}Yb^+}$ ions localized in
a radio-frequency trap, the verification of the ionization process is performed
by characterizing the properties of the resulting mixed-species ion-crystal.
The obtained results facilitate fundamental studies of physics involving
$\mathrm{Yb^{2+}}$ ions.
