Materials Literature
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Translational energy distributions of neutral potassium atoms are reported as a function of potassium coverage after uv-laser-induced desorption from well-characterized adsorption sites on an epitaxial film of ${\mathrm{Cr}}_{2}{\mathrm{O}}_{3}(0001)/\mathrm{C}\mathrm{r}(110).$ Measurements using x-ray photoelectron s…
In the chromophore-quencher complex fac-[Re(Aqphen)(CO)(3)(py-PTZ)](+) (Aqphen is 12,17-dihydronaphtho[2,3-h]dipyrido[3,2-a:2',3'-c]-phenazine-12,17-dione; py-PTZ is 10-(4-picolyl)phenothiazine), Aqphen is a dppz derivative, containing a pendant quinone acceptor at the terminus of a rigid ligand framework. This introd…
In situ synchrotron radiation measurements of porous silicon (PS) strain have been performed during ultrahigh vacuum (UHV) thermal annealing. For a p+ sample, the initial lattice expansion shifts toward a contraction above 270 °C in relation with hydrogen desorption. For a p− sample, the strain variation is similar to…
The combined effect of shape and dielectric mismatch between dot and matrix on several electronic properties of semiconductor quantum dots have been studied. In particular, the electronic properties of spherical and cubic quantum dots that have been analyzed are the integrated density of states, the polarization self-…
In this paper we present the optical properties of various structural models for $a\ensuremath{-}\mathrm{Si}$ and $a\ensuremath{-}\mathrm{S}\mathrm{i}:\mathrm{H}.$ We discuss how topological disorder, hydrogen content, and different types of defects (dangling bonds and floating bonds) influence the shape of the optica…
Pseudomonas oleovorans contains an isomerase which catalyzes the cis-trans conversion of the abundant unsaturated membrane fatty acids 9-cis-hexadecenoic acid (palmitoleic acid) and 11-cis-octadecenoic acid (vaccenic acid). We purified the isomerase from the periplasmic fraction of Pseudomonas oleovorans. The molecula…
Molecular dynamics simulations are carried out to study the structure formation of 100 short chain molecules, each of which consists of 20 CH2 groups. Our simulations show that the orientationally ordered structure is formed from a random configuration by quenching. The global orientational order starts to increase su…
Intrinsic electrical properties of Au/Nb-doped SrTiO3(001) (STO:Nb) Schottky junctions, fabricated using a proper surface treatment of the STO:Nb and in situ deposition of Au, were investigated in detail. Current–voltage characteristics and photocurrent–wavelength characteristics have shown a temperature-dependent and…
This paper deals with the adsorption states of ammonia on both the Brönsted and Lewis acid sites of V 2 O 5 (010) surface using the periodic boundary first-principles density functional (DFT) calculations. The calculated results indicate that ammonia adsorption takes place on both the Brönsted and Lewis sites of V 2 O…
Angle-resolved core-level photoemission has been utilized to study the surfaces of crystalline thin films of manganite ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ ($x=0.1$ and 0.35). It is found that both the surface termination and Ca surface concentration depend on the bulk Ca concentration…
CdS thin films are grown by photochemical deposition from an aqueous solution and characterized by x-ray diffraction (XRD), Raman spectroscopy, photoluminescence measurement, and optical transmission spectroscopy. The films are deposited at room temperature and annealed at temperatures up to 500 °C. The as-deposited f…
The local orbital extension of the linearized augmented plane wave (LAPW+LO) method within the general gradient approximation was used to determine structural and ferroelectric properties of tetragonal ${\mathrm{PbTiO}}_{3}$ (PT), and two chemically ordered ${\mathrm{PbZr}}_{1/2}{\mathrm{Ti}}_{1/2}{\mathrm{O}}_{3}$ (P…
Based on ab initio calculations of electronic structure and properties of five crystals: $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Al}}_{2}{\mathrm{O}}_{3},$ ${\mathrm{Y}}_{3}{\mathrm{Al}}_{5}{\mathrm{O}}_{12},$ ${\mathrm{YAlO}}_{3},$ ${\mathrm{Y}}_{4}{\mathrm{Al}}_{2}{\mathrm{O}}_{9},$ ${\mathrm{Y}}_{2}{\mathrm{O}}_…
Band structure of the ferrimagnetic Fe 3 O 4 was calculated in the high temperature cubic phase by means of the full-potential linearized augmented-plane-wave method with the local spin density approximation. In the majority spin bands, the Fermi level stays in the band gap and 3d states of A site Fe are unoccupied wh…
Artificial atoms, i.e., systems of excess electrons confined in semiconductor quantum dots, are studied by the unrestricted Hartree-Fock method. We consider a spherical quantum dot embedded in an insulating matrix and assume a confinement potential in a form of spherical potential well of radius R and depth ${V}_{0}.$…
In this paper we describe collective properties of silver nanoparticles organized in two-dimensional superlattices. Our aim is to show that we can control the state of organization of the silver particles deposited on the substrate. Then the particles are found in the form of either a well-organized two-dimensional ar…
Amorphous and nanostructured carbon films were grown by using two different techniques: ion sputtering and cluster beam deposition. The films were studied by near-edge x-ray absorption fine structure (NEXAFS) and Raman spectroscopy. Depending on the precursors, atoms, or clusters, the films are characterized by a diff…
Powder neutron diffraction has been used to study the nature of the structural transition away from the Fd 3 m cubic structure upon cooling below ∼285 K in the spinel LiMn 2 O 4 . We report powder data taken between 10 K and 333 K and propose a large cell tetragonal structure in space group I 4 1 / amd for the materia…
Pyroelectric lead zirconate titanate (PZT) thin films have been prepared by a sol-gel method and characterized by x-ray diffraction and transmission electron microscopy (TEM). A metastable Pt3Pb intermetallic phase has been identified. The formation of this metastable phase was found to depend on the drying temperatur…
The $s,p\ensuremath{-}d$ exchange interaction of p-type ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As} (x<0.05)$ epilayers is investigated by means of magnetoabsorption. The observed ferromagnetic-type splitting of fundamental absorption edge is explained by antiferromagnetic $p\ensuremath{-}d$ excha…