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dc.contributor.advisor Smalley, Richard E.
dc.creatorLaaksonen, Reima Tapani
dc.date.accessioned 2009-06-04T00:01:59Z
dc.date.available 2009-06-04T00:01:59Z
dc.date.issued 1991
dc.identifier.urihttps://hdl.handle.net/1911/16456
dc.description.abstract Positively charged clusters of V, Nb, Ta, Co, Rh, Ir, and Ni in the size range of 3-26 atoms were generated by laser vaporization in a supersonic nozzle and injected into the ion trap of a Fourier transform ion cyclotron resonance apparatus, where they were studied by exposing them to hydrogen gas. Some clusters experience structural changes during the chemisorption process, and some clusters have multiple stable isomers. The reactivity of positive V, Nb, and Ta clusters toward H$\sb2$ increases with cluster size, but the reactivity oscillates so that the even clusters can be several orders of magnitude less reactive than their odd neighbors. The reactivity of positive Co, Rh, Ir, and Ni clusters toward H$\sb2$ varies with the cluster size, but the variation is smooth. In general clusters made of atoms with the same number of valence electrons behave quite similarly. The high reactivity of most positive clusters is attributed to unoccupied d-like states lying near the fermi level--these states are needed to avoid the Pauli repulsion, which creates the activation barrier for the H$\sb2$ chemisorption.
dc.format.extent 80 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectCondensed matter physics
Physical chemistry
dc.title Hydrogen chemisorption on transition metal clusters
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Chemistry
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy
dc.identifier.citation Laaksonen, Reima Tapani. "Hydrogen chemisorption on transition metal clusters." (1991) Diss., Rice University. https://hdl.handle.net/1911/16456.


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