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Adsorption and Desorption of NO and NO₂ Molecules on Gold Cluster Anions Observed by Thermal Desorption Spectrometry
- Yamaguchi, Masato, Mafuné, Fumitaka
- Journal of physical chemistry 2019 v.123 no.25 pp. 15575-15581
- adsorption, anions, desorption, gases, gold, nitric oxide, nitrogen dioxide, spectroscopy
- The adsorption and thermal desorption of NO and NO₂ molecules on gold cluster anions, Au₄–, were experimentally observed using gas-phase thermal desorption spectrometry. Multiple collisions of NO molecules with Au₄– at 300 K generated Au₄(NO)ₖ– (k = 1–3). The NO molecules desorbed from the clusters in a stepwise manner when the clusters were heated, and finally Au₄– was regenerated above 600 K. For NO₂, Au₄N₂O₄– was found to be thermally unstable. Hence, two NO₂ molecules were sequentially released from Au₄N₃O₆–, when Au₄N₃O₆– was heated at 500–800 K, forming Au₄NO₂–. A gold oxide cluster, Au₄O₂–, was produced as a result of the decomposition of NO₂ to NO and O on Au₄–, and the NO molecules were released above 900 K.