To investigate the effect of adsorbates on structural transitions in small palladium aggregates, we have performed molecular dynamics simulations of cluster “melting” in presence of atomic hydrogen. Intriguing questions are how the exposure to hydrogen modifies the metal-metal interaction, and whether hydrogen could lower the onset of melting. Various structural and caloric methods were used to...

Products of T.P.D. per cent CO CO, C,H,+C,H, Recent studies of catalysis by supported metal cluster compounds have shown that these systems exhibit novel behaviour. Although diffzcult to characterise, by using a combination of analytical techniques an overall picture can be developed of the cluster nuclearity and the number and type of ligands present. Chemisorption and catalytic studies have b...

We investigate the evolution of metal deficient stellar structures, presenting H-burning isochrones covering cluster ages from 800 Myr to 7 Gyr. Evolutionary evidences for selection effects in the metallicity distribution of very metal poor H-burning red giants are reported. The evolution of stars during central and shell He burning is further investigated, discussing the occurrence of He burni...

The initial employment of alpha-benzoin oxime (bzoxH(2)) in higher oxidation state 3d metal cluster chemistry has provided access to a new enneanuclear Mn(III) complex with an unprecedented metal-core topology consisting of two triangular [Mn(3)(mu(3)-Omicron(2-))(mu-OmicronNu)(3)](4+) fragments connected by a linear [Mn(3)(mu-OmicronNu)(6)](3+) unit. The Mn(III)(9) cluster is antiferromagnetic...

ABSTR,6CT. The development of topological rules for hydrido-metal cluster compounds, similar to those proposed by Lipscomb for boron hydrides, is shown to be a direct consequence of the multicentre bonding in bridged hydrido-metal bonds. Evidence for this localised view of the bonding has been obtained from U.V. photoelectron spectral studies of the hydridocarbonyl cluster compounds Re3(CO)12H3...

Investigation of the formation mechanism is crucial in order to develop a large scale, high-purity, and chirality-controlled generation of single-walled carbon nanotubes (SWNTs). Recently, we have developed a high-quality synthesis technique of SWNTs at relatively low-temperature by catalytic chemical vapor deposition (CCVD) technique using alcohol as the carbon source [1]. In addition, we have...

Electrospray ionization of metal salt solutions followed by ambient heating transforms the resulting salt clusters into new species, primarily naked ionic metal clusters. The experiment is done by passing the clusters through a heated coiled loop outside the mass spectrometer which releases the counter-anion while generating the anionic or cationic naked metal cluster. The nature of the anion i...

We present low resolution, integrated Keck spectra of the five globular clusters (GCs) of the Fornax dwarf spheroidal galaxy. We find a tentative age spread among the clusters, with the GC H5 younger by 2–3 Gyr than the others. The clusters generally appear to be very metal-poor ([Fe/H] ∼ −1.8), with the cluster H4 slightly more metal-rich at [Fe/H] = −1.5. We speculate that cluster H4 is simil...