  The resonance ionization laser ion source (RILIS) is the principal ion source
of the ISOLDE radioactive beam facility based at CERN. Using the method of
in-source resonance ionization spectroscopy, an optimal three-step,
three-resonance photo-ionization scheme has been developed for chromium. The
scheme uses an ionizing transition to one of the 14 newly observed autoionizing
states. This work increases the range of ISOLDE-RILIS ionized beams to 32
chemical elements. Details of the spectroscopic studies are described and the
new ionization scheme is summarized. A link to the complete version of this
document will be added here following publication:
