PHOTOEMISSION STUDY OF THE ELECTRONIC STRUCTURE OF SIZE-SELECTED Ptn — CLUSTERS DEPOSITED ON Ag(110)

We report on a photoemission study (XPS, UPS) of the evolution of the electronic structure with cluster size of Pt n ( n = 1-10) clusters deposited on a Ag(110) single crystal surface. The clusters are produced by Xe-ion bombardment of a Pt target. The ionized clusters are mass-selected by a quadrupole mass spectrometer and guided to the substrate by an RF-mode only quadrupole. The substrate is in the center of the analysis chamber allowing in-situ characterization of the supported clusters. Photoemission spectra taken on submonolayer quantities of mass-selected monodispersed Pt clusters indicate individual discrete electronic structure features of the Pt 5d emission. In the atomic-like limit virtual bound state formation with different 5d3/2 and 5d5/2 line broadening is observed which points to an energy dependent Vsd hopping matrix element in agreement with theoretical predictions. With increasing cluster size the splitting between the bonding-like and antibonding-like Pt 5d states reflects the Pt-Pt interaction. The shift of the center of gravity of the Pt 5d state towards the Fermi energy and their concomittant broadening indicate the trend to Pt-metal formation.

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In Situ Characterization of the Mechanical Behavior of Gecko's Spatulae by Atomic Force Microscopy

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.22.85 ◽

2013 ◽

Vol 22 ◽

pp. 85-93

Author(s):

Shuang Yi Liu ◽

Min Min Tang ◽

Ai Kah Soh ◽

Liang Hong

Keyword(s):

Mechanical Behavior ◽

Hierarchical Level ◽

Intrinsic Properties ◽

In Situ Characterization ◽

Force Microscopy ◽

Atomic Force ◽

Theoretical Predictions ◽

Multi Mode

In-situ characterization of the mechanical behavior of geckos spatula has been carried out in detail using multi-mode AFM system. Combining successful application of a novel AFM mode, i.e. Harmonix microscopy, the more detail elastic properties of spatula is brought to light. The results obtained show the variation of the mechanical properties on the hierarchical level of a seta, even for the different locations, pad and stalk of the spatula. A model, which has been validated using the existing experimental data and phenomena as well as theoretical predictions for geckos adhesion, crawling and self-cleaning of spatulae, is proposed in this paper. Through contrast of adhesive and craw ability of the gecko on the surfaces with different surface roughness, and measurement of the surface adhesive behaviors of Teflon, the most effective adhesion of the gecko is more dependent on the intrinsic properties of the surface which is adhered.

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In-Situ Characterization of Growth and Intermixing at a Heteroepitaxial Interface: Fe on Au(001)

MRS Proceedings ◽

10.1557/proc-318-13 ◽

1993 ◽

Vol 318 ◽

Author(s):

Q. Jiang ◽

A. Chan ◽

Y.-L. He ◽

G.-C. Wang

Keyword(s):

Elevated Temperatures ◽

Chemical Elements ◽

Background Intensity ◽

In Situ Characterization ◽

Initial Stage ◽

Monolayer Growth ◽

Low Energy Electron ◽

Energy Dependent

ABSTRACTThe growth and chemical intermixing of submonolayer and a few monolayer thick Fe films on a Au(001) surface was studied by High Resolution Low Energy Electron Diffraction (HRLEED) technique. Through the analysis of the energy dependent angular profiles as a function of time, we obtained the distribution of islands and distribution of spacings during submonolayer growth. The interference of electron waves from different chemical elements in terraces at different heights in the surface contributes to the background intensity and broadening in the angular profiles of diffraction beams. A subsurface Fe capped by Au islands as a result of atomic place exchange was observed at the initial stage of monolayer growth. From the energy dependent angular profiles as a function of temperature, we determine the quantitative change of inhomogeneity length (∼20 Å) at the interface of ultrathin films at elevated temperatures due to intermixing.

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In-situ characterization of tip electronic structure in scanning tunneling microscopy

Ultramicroscopy ◽

10.1016/0304-3991(92)90259-m ◽

1992 ◽

Vol 42-44 ◽

pp. 147-153 ◽

Cited By ~ 9

Author(s):

C.Julian Chen

Keyword(s):

Electronic Structure ◽

Scanning Tunneling Microscopy ◽

Scanning Tunneling ◽

Tunneling Microscopy ◽

In Situ Characterization

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In Situ Characterization of the Mechanical Behavior of Gecko’s Spatulae by Atomic Force Microscopy

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.25.101 ◽

2013 ◽

Vol 25 ◽

pp. 101-109 ◽

Cited By ~ 1

Author(s):

Shuang Yi Liu ◽

Min Min Tang ◽

Ai Kah Soh ◽

Liang Hong

Keyword(s):

Mechanical Behavior ◽

Hierarchical Level ◽

Intrinsic Properties ◽

In Situ Characterization ◽

Force Microscopy ◽

Atomic Force ◽

Theoretical Predictions ◽

Multi Mode

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In-situ characterization of doping-effect on electronic structure of epitaxial films of infinite layer SrCuO2

Czechoslovak Journal of Physics ◽

10.1007/bf02570328 ◽

1996 ◽

Vol 46 (S5) ◽

pp. 2683-2684 ◽

Cited By ~ 5

Author(s):

N. Terada ◽

A. Iyo ◽

Y. Sekita ◽

S. Ishibashi ◽

H. Ihara

Keyword(s):

Electronic Structure ◽

Epitaxial Films ◽

Doping Effect ◽

In Situ Characterization ◽

Infinite Layer

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Experimental routes to in situ characterization of the electronic structure and chemical composition of cathode materials for lithium ion batteries during lithium intercalation and deintercalation using photoelectron spectroscopy and related techniques

Ionics ◽

10.1007/s11581-009-0339-z ◽

2009 ◽

Vol 15 (4) ◽

pp. 393-403 ◽

Cited By ~ 20

Author(s):

A. Thißen ◽

D. Ensling ◽

M. Liberatore ◽

Q.-H. Wu ◽

F. J. Fernandez Madrigal ◽

...

Keyword(s):

Electronic Structure ◽

Chemical Composition ◽

Lithium Ion Batteries ◽

Cathode Materials ◽

Photoelectron Spectroscopy ◽

Lithium Ion ◽

Lithium Intercalation ◽

In Situ Characterization

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Characterization of the glycoconjugates of boar testis and epididymis

Reproduction ◽

10.1530/reprod/120.2.325 ◽

2000 ◽

pp. 325-335 ◽

Cited By ~ 29

Author(s):

A Calvo ◽

LM Pastor ◽

S Bonet ◽

E Pinart ◽

M Ventura

Keyword(s):

Ricinus Communis ◽

Lectin Histochemistry ◽

Apical Part ◽

Seminiferous Tubules ◽

In Situ Characterization ◽

Intense Staining ◽

Terminal Galactose ◽

Boar Spermatozoa

Lectin histochemistry was used to perform in situ characterization of the glycoconjugates present in boar testis and epididymis. Thirteen horseradish peroxidase- or digoxigenin-labelled lectins were used in samples obtained from healthy fertile boars. The acrosomes of the spermatids were stained intensely by lectins with affinity for galactose and N-acetyl-galactosamine residues, these being soybean, peanut and Ricinus communis agglutinins. Sertoli cells were stained selectively by Maackia ammurensis agglutinin. The lamina propria of seminiferous tubules showed the most intense staining with fucose-binding lectins. The Golgi area and the apical part of the principal cells of the epididymis were stained intensely with many lectins and their distribution was similar in the three zones of the epididymis. On the basis of lectin affinity, both testis and epididymis appear to have N- and O-linked glycoconjugates. Spermatozoa from different epididymal regions showed different expression of terminal galactose and N-acetyl-galactosamine. Sialic acid (specifically alpha2,3 neuraminic-5 acid) was probably incorporated into spermatozoa along the extratesticular ducts. These findings indicate that the development and maturation of boar spermatozoa are accompanied by changes in glycoconjugates. As some lectins stain cellular or extracellular compartments specifically, these lectins could be useful markers in histopathological evaluation of diseases of boar testis and epididymis.

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