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Oxygen desorption from cationic vanadium oxide clusters, VnOm+ (n=2–10), composed of a near-stoichiometric (n:m=2:5) frame with excess oxygen attached was investigated in a thermal energy region by time-of-flight mass spectrometry and thermal desorption spectrometry. Oxygen molecules were observed to desorb from the clusters during heating. The activation energy for desorption was estimated from the...