O2 photodesorption from AuO2− and Au2O2−
O2 photodesorption from AuO2− and Au2O2−
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AuO2− 和 Au2O2− 中的 O2 光解吸
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
G. Ganteför
中科院分区：
文献类型：
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作者：
K. Koyasu;W. Westhäuser;M. Niemietz;J. Heinen;G. Ganteför
Using time-resolved photoelectron spectroscopy, the decay channels of AuO2− and Au2O2− following photoexcitation with 3.1-eV photons have been studied. For AuO2−, a state with a rather long lifetime of 30 ps has been identified. Its decay path could not be determined but photodesorption can be excluded. For Au2O2−, the spectra indicate O2 desorption after 3.1-eV photoexcitation on a time scale of 1 ps. While comparing these results on AunO2− with analogous data on AgnO2− clusters, a discernible pattern emerges: for dissociatively bound O2(AuO2−, Ag3O2−), there are long-living excited states which do not decay by oxygen desorption, while for molecular chemisorption (Au2O2−, Ag2O2−, Ag4O2−, Ag8O2−), the 3.1-eV photoexcitation triggers fast O2 desorption with a high quantum yield.
