Atomic Clusters: From Gas Phase to Deposited by D. P. Woodruff PDF

By D. P. Woodruff

ISBN-10: 0444527567

ISBN-13: 9780444527561

Atomic Clusters: From fuel part to Deposited brings jointly a sequence of chapters, ready by means of stated specialists of their fields. either basic and functional features are addressed of the physics and chemistry of a unique country of subject, particularly clusters of small numbers of atoms of nanometre dimensions. this can be a box of nanoscience that existed prior to the notice was once invented, yet has fairly completed significant advances within the contemporary years.

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Read e-book online Atomic Clusters: From Gas Phase to Deposited PDF

Atomic Clusters: From fuel section to Deposited brings jointly a sequence of chapters, ready via said specialists of their fields. either basic and functional elements are addressed of the physics and chemistry of a unique country of topic, specifically clusters of small numbers of atoms of nanometre dimensions.

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Example text

The peaks in the LDOS of the O2 molecule can clearly be assigned to the 5s and 1p orbitals. The uppermost sd-band of the Au8 shows metallic character, meaning that occupied states extend continuously up to the Fermi energy. The LUMO of the O2 molecule lies below the Fermi level, and is thus in resonance with the sd-band of the Au8 cluster. A charge transfer from the cluster to the antibonding 2pà orbital occurs. This backdonation is responsible for the weakening and elongation of the O–O bond. In addition, this activation is accompanied by a change of the spin state of the O2, from a triplet state in the gas phase to a peroxo-like state with zero net spin in the O2/Au8/MgO(FC) complex.

Compared to the relatively detailed understanding of the CO oxidation reaction on single crystals, less is known at the molecular level for supported Pd nanoparticles. Based on studies on different Pd single crystals, the CO oxidation reaction was considered to be insensitive to structure. Consequently, as discussed by Boudart et al. [58], the reaction rate should be independent of the size of supported Pd particles. However, Stara et al. [59] reported significant size effects by studying the transient CO2 formation on Pd nanoparticles supported on Al2O3.

23a and b for selected temperatures. CO was dosed at a partial pressure of 5 Â 10À7 mbar, whereas NO was pulsed at the time t ¼ 0 effecting a partial pressure Figure 23: Transient CO2 formation at selected temperatures measured in a pulsed molecular beam experiment on (a) Pd30 and (b) Pd8. CO was dosed at an isotropic CO pressure of 5 Â 10À7 mbar, whereas at the time t ¼ 0 NO was pulsed effecting a partial pressure of 1 Â 10À4 mbar. 1 sec) plotted as a function of temperature. 34 MATTHIAS ARENZ, STEFAN GILB AND UELI HEIZ of 1 Â 10À4 mbar.

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Atomic Clusters: From Gas Phase to Deposited by D. P. Woodruff


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