科研之友
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摘要
We determined the desorption energies of O-2 molecules from AunO2- (n = 2, 4, 6, 8, 10, 12, and 14) by gas phase thermal desorption spectrometry. Cluster anions, AunO2-, prepared in the gas phase were heated inside a temperature-controlled copper tube. Formation of Au-n(-) from the desorption of O-2 was observed as a function of temperature. Temperature dependence of the intensities of AunO2- and Au-n(-) was analyzed using the Arrhenius equation, estimating the desorption energy of O-2 from AunO2-. Considering the geometrical structure of AunO2-, the desorption energy must be the same as or slightly higher than the binding energy of O-2 to Au-n(-), because the desorption of O-2 proceeds by a simple bond cleavage of Au-n(-)-O-2, without significant rearrangement of atoms in the cluster. The collision-induced dissociation experiments show that the desorption energy was nearly equal to or slightly lower than the threshold energy for n = 2, 4, and 6.
- 出版日期2016-10-13
