Palladium,,oxide cluster,ions, PdnOm+, were prepared-in the gas phase using laser ablation of a palladium rod in the presence of oxygen. The cluster ions were, heated to 1000 K downstream from the cluster source (post heatifrig), and ti* abundance of PdnOm+ (n = 2-7) wag examined using mass spectrometry. Temperature-programmed detorption experiments revealed that an oxygen -Molecule is released from oxygen-rich PdnOm+, forming oxygen-deficient PdnOm-2+, It was found that Pd6O4+ was thermally Stable up-to 1000 K. The activation energy for oxygen molecule desorption has been obtained and compared: with previous results by Lang et al.