Release of Oxygen from Palladium Oxide Cluster Ions by Heat

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• 作者：Ken Miyajima ; Fumitaka Mafun茅
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：July 23, 2015
• 年：2015
• 卷：119
• 期：29
• 页码：8055-8061
• 全文大小：572K
• ISSN：1520-5215

文摘

Palladium oxide cluster ions, Pd_nO_m⁺, 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 heating), and the abundance of Pd_nO_m⁺ (n = 2鈥?) was examined using mass spectrometry. Temperature-programmed desorption experiments revealed that an oxygen molecule is released from oxygen-rich Pd_nO_m⁺, forming oxygen-deficient Pd_nO_m鈥?⁺. 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.