NDLI: Is gold actor or spectator in the reaction of small AunPd m + clusters with O2?

Content Provider	Springer Nature Link
Author	Lang, Sandra M. Frank, Anja Fleischer, Irene Bernhardt, Thorsten M.
Copyright Year	2013
Abstract	The reactivity of free binary gold-palladium clusters (AuPd\hbox{ $_2^+$ }+2, Au2Pd+, Au2Pd\hbox{ $_2^+$ }+2, and Au2Pd\hbox{ $_3^+$ }+3) toward molecular oxygen was investigated in an ion trap experiment under multi-collision conditions and compared to the reactivities of bare Au\hbox{ $_n^+$ }+n and Pd\hbox{ $_m^+$ }+m (n, m = 2 − 5) clusters. Reaction kinetics measurements revealed that the reaction rate is mainly determined by the number of palladium atoms in the clusters and only weakly influenced by additional gold atoms. The same holds true for the observed reaction product distributions. Most interestingly, the most reactive cluster ions Pd\hbox{ $_3^+$ }+3, Au2Pd\hbox{ $_3^+$ }+3, and Pd\hbox{ $_5^+$ }+5 exhibit a strong preference to form tetroxide products, Au n Pd m O\hbox{ $_4^+$ }+4. In addition, employing temperature dependent mass spectrometry, a second adsorption species consisting of several weakly bound oxygen molecules was identified for all investigated palladium containing clusters which is, however, only formed at cryogenic temperatures. All these observations suggest that the gold atoms largely act upon a spectator role in the reaction of the binary clusters. Nevertheless, a rough estimation of the relative O2 binding energies via statistical rate theory indicates that the addition of gold to the Pd\hbox{ $_n^+$ }+n clusters decreases the O2-cluster interaction strength, although the reaction rate stays constant. This effect in the binary clusters may be of importance to a potential activation and dissociation of the adsorbed O2 molecules.
Starting Page	1
Ending Page	7
Page Count	7
File Format	PDF
ISSN	14346060
Journal	The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics
Volume Number	67
Issue Number	1
e-ISSN	14346079
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-02-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atomic, Molecular, Optical and Plasma Physics Physical Chemistry Quantum Physics Quantum Information Technology, Spintronics Spectroscopy/Spectrometry Nonlinear Dynamics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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