1,720,979 research outputs found
Photoelectron spectroscopy of f-element organometallic complexes. 3. Chloro, bromo, methoxy, and methyl complexes of triindenylthorium(IV) and -uranium(IV)
No full textPhotoelectron spectroscopy of f-element organometallic complexes. 6. Electronic structure of tetrakis(cyclopentadienyl) actinide complexes
No full textA description of the electronic structure of M(.eta.5-C5H4CH3)4 (M = Th, U) complexes as based upon He I and He II photoelectron spectra and relativistic Xa-SW calculations is presented. Despite the true S4 symmetry of the molecules, the outermost MO’s are grouped as if the complexes have a pure tetrahedral ligation environment. As a consequence, donation to empty metal orbitals appears to be highly dominated by the symmetry requirements. The HOMO in Cp’,U is almost pure 5f in character, and the corresponding 2F5/2 final state produced upon ionization is split by operation of a Td ligand field. The relative intensity variations
observed on passing from He I to He II spectra are quite unexpected. It appears that the He I1 increases of PE signals due to MO’s having large metal 6d character are greater than those due to MO’s having comparable 5f admixture
Grafting cavitands on the Si(100) surface
No full textGrafting cavitands on the Si(100) surface ABSTRACT: Cavitand molecules having double bond terminated alkyl chains and different bridging groups at the upper rim have been grafted on H-terminated Si(100) surface via photochemical hydrosilylation of the double bonds. Pure and mixed monolayers have been obtained from mesitylene solutions of either pure cavitand or cavitand/1-octene mixtures. Angle resolved high-resolution X-ray photoelectron spectroscopy has been used as the main tool for the monolayer characterization. The cavitand decorated surface consists of Si-C bonded layers with the upper rim at the top of the layer. Grafting of pure cavitands leads to not-well-packed layers, which are not able to efficiently passivate the Si(100) surface. By contrast, monolayers obtained from cavitand/1-octene mixtures consist of well-packed layers since they prevent silicon oxidation after aging. AFM measurements showed that these monolayers have a structured topography, with objects protruding from the Si(100) surface with average heights compatible with the expected ones for cavitand molecules
Properties of single- and double-sided TlBaCaCuO films grown by MOCVD and their potential applications to microwave devices,
No full textProperties of single- and double-sided TlBaCaCuO films grown by MOCVD and their potential applications to microwave devices,
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Fabbricazione di multilayers metallo-isolante-superconduttore tramite chemical metal-organic vapor deposition (MOCVD)
No full textDottorato di ricerca in scienze chimiche. 12. ciclo. A.a. 1996-99. Tutore I. L. Fragala'. Coordinatore G. MusumarraConsiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7, Rome; Biblioteca Nazionale Centrale - P.za Cavalleggeri, 1, Florence / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
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