Cage Structure Formation of Singly Doped Aluminum Cluster Cations AlnTM+ (TM = Ti,V, Cr) |
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Authors: | Sandra M. Lang Pieterjan Claes Sven Neukermans Ewald Janssens |
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Affiliation: | (1) Laboratory of Solid State Physics and Magnetism, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium;(2) Present address: Institute of Surface Chemistry and Catalysis, University of Ulm, 89069 Ulm, Germany; |
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Abstract: | Structural information on free transition metal doped aluminum clusters, Al n TM + (TM = Ti, V, Cr), was obtained by studying their ability for argon physisorption. Systematic size (n = 5 – 35) and temperature (T = 145 – 300 K) dependent investigations reveal that bare Al n + clusters are inert toward argon, while Al n TM + clusters attach one argon atom up to a critical cluster size. This size is interpreted as the geometrical transition from surface-located dopant atoms to endohedrally doped aluminum clusters with the transition metal atom residing in an aluminum cage. The critical size, n crit , is found to be surprisingly large, namely n crit = 16 and n crit = 19 – 21 for TM = V, Cr, and TM = Ti, respectively. Experimental cluster–argon bond dissociation energies have been derived as function of cluster size from equilibrium mass spectra and are in the 0.1–0.3 eV range. |
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