The blue A2PI-X2PI emission system of the (AgO)-Ag-107-O-18 molecule e
xcited in a low-pressure arc, was recorded in the region 400-475 nm wi
th medium dispersion. The vibrational analysis, supported by isotope s
hifts study, of the red-degraded bands has been made. The final set of
the improved (AgO)-Ag-107-O-16 and the new (AgO)-Ag-107-O-18 vibratio
nal constants of the two sub-systems involved in transition are determ
ined.