  Ultraviolet spectra of the extended solar corona have been routinely obtained
by SoHO/UVCS since 1996. Sudden variations of spectral parameters are mainly
due to the detection of Coronal Mass Ejections (CMEs) crossing the instrumental
slit. We present a catalog of CME ultraviolet spectra based upon a systematic
search of events in the LASCO CME catalog, and we discuss their statistical
properties. Our catalog includes 1059 events through the end of 2005, covering
nearly a full solar cycle. It is online available at the URL
http://solarweb.oato.inaf.it/UVCS_CME and embedded in the online LASCO CME
catalog (http://cdaw.gsfc.nasa.gov/CME_list). The emission lines observed
provide diagnostics of CME plasma parameters, such as the light-of-sight
velocity, density and temperature and allow to link the CME onset data to the
extended corona white-light images. The catalog indicates whether there are
clear signatures of features such as shock waves, current sheets, O VI flares,
helical motions and which part of the CME structures (front, cavity or
prominence material) are detected. The most common detected structure is the
cool prominence material (in about 70% of the events). For each event, the
catalog also contains movie, images, plots and information relevant to address
detailed scientific investigations. The number of events detected in UV is
about 1/10 of the LASCO CMEs, and about 1/4 of the halo events. We find that
UVCS tends to detect faster, more massive and energetic CME than LASCO and for
about 40% of the events events it has been possible to determine the plasma
light-of-sight velocity.
