(Acridine)trimethylgallium–Acridine (2/1)
The reaction of excess trimethylgallium with acridine in diethyl ether gave the title layer inclusion compound, [Ga(CH 3 ) 3 (C 13 H 9 N)].0.5C 13 H 9 N. The Ga-N bond length is 2.203 (3) A.
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Synthesis and characterization of iron carbonitride ultrafine particles
Iron carbonitride (ICN) ultrafine particles (20–80 nm in size) have been synthesized by laser-induced pyrolysis of Fe(CO)5–NH3–C2H4 mixture. The surface morphology, structural characteristics, oxidation behavior, and the magnetic properties of the ICN particles were reported. The role the thin carbon layer formed on t…
CsLaNb2O7
The title compound, caesium lanthanum diniobium heptaoxide, belongs to the ARNb2O7 (A = K, Rb, Cs; R = La, Nd) family of compounds and crystallizes as a layered structure in which the Cs+ ions are located in the interlayer gap formed by double perovskite LaNb2O7 layers. The single-crystal X-ray refinement of the struc…
Theoretical study of the electromigration wind force for adatom migration at metal surfaces
We present the results of a theoretical investigation of the electromigration wind force for adatom migration in a number of migrator-substrate systems. The theoretical background for our study follows from previous work done on bulk electromigration using the linear-response formalism of Kubo. We treat the electronic…
Study of the cracking of highly porous p+ type silicon during drying
The origin of the cracking of highly porous silicon layers during drying is investigated. Optical and scanning electron microscopy observation allow us to observe the cracking occurrence. In situ x-ray diffraction experiments, under controlled vapor pressure of pentane, reveal that large capillary stresses occur at a…
Adsorption and temperature-dependent decomposition ofSO2on Cu(100) and Cu(111): A fast and high-resolution core-level spectroscopy study
The adsorption and temperature-dependent decomposition of ${\mathrm{SO}}_{2}$ on Cu(100) and Cu(111) have been studied by fast and high-resolution core-level photoemission. The analysis of the S 2p and O 1s data shows that molecular ${\mathrm{SO}}_{2}$ adsorption dominates at 170 K. On heating the ${\mathrm{SO}}_{2}$-…
Structure of the diamond (111) surface: Single-dangling-bond versus triple-dangling-bond face
We present converged first-principles calculations for the atomic and electronic structure of diamond (111) surfaces based on density-functional theory in the local-density approximation. Single- and triple-dangling- bond surfaces with 1\ifmmode\times\else\texttimes\fi{}1, 2\ifmmode\times\else\texttimes\fi{}1, and ($\…
Structural, optical, and electronic properties of magnetron-sputtered platinum oxide films
Stable platinum oxide films have been prepared through magnetron sputtering and have been analyzed on the bases of energy-sensitive microanalyses, x-ray diffraction, resistivity, and optical reflectance measurements. The complex dielectric function has been determined for various oxygen contents in the film covering t…
Curvature-induced bonding changes in carbon nanotubes investigated by electron energy-loss spectrometry
Effect of curvature-induced strain on the covalent bonding in isolated and selected single-shell and multi- shell carbon nanotubes is explored, using electron energy-loss spectroscopy (EELS) on the core K level, which probes the distribution of available unoccupied states in the conduction band. Results show that the…
Photoluminescence spectrum and dynamics in oxidized silicon nanocrystals: A nanoscopic disorder system
We have studied luminescence properties of nanometer-sized Si crystallites fabricated by laser breakdown of ${\mathrm{SiH}}_{4}$ gas. An exponential absorption tail is observed and red photoluminescence (PL) appears in the exponential tail. The PL decay behavior is characterized by a stretched exponential function. At…
Electronic structure of the N-Vcenter in diamond: Experiments
Quantum-beat spectroscopy has been used to observe excited states of the N-V center in diamond. For the 1.945-eV optical transition, direct evidence is presented for the existence of GHz-scale fine structure, together with a much larger 46-${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ level splitting in the E state. An i…
Orbital and spin orderings inYVO3andLaVO3in the generalized gradient approximation
The orbital and spin orderings of ${\mathit{d}}^{2}$ Jahn-Teller systems are studied in the generalized gradient approximation (GGA) by using the full-potential linearized augmented-plane-wave method. For the low temperature distorted crystal structures in ${\mathrm{YVO}}_{3}$ and ${\mathrm{LaVO}}_{3}$ perovskites, we…
Polarizing beam splitter based on the anisotropic spectral reflectivity characteristic of form-birefringent multilayer gratings
We introduce a novel polarizing beam splitter that uses the anisotropic spectral reflectivity (ASR) characteristic of a high-spatial-frequency multilayer binary grating. Such ASR effects allow us to design an optical element that is transparent for TM polarization and reflective for TE polarization. For normally incid…
Size-dependent two-photon excitation spectroscopy of CdSe nanocrystals
Two-photon excitation spectra of highly monodisperse colloidal CdSe nanocrystals with sizes ranging from 22 to 43 \AA{} are compared to one-photon excitation data and to a spherically confined effective-mass model. The main experimental features are well described by this model. However, the first one-photon and two-p…
Melts of semiflexible diblock copolymer
Melts of semiflexible AB diblock copolymers are studied using the wormlike chain model and self-consistent-field theory. The diblocks considered here are symmetric in composition and in A- and B-block flexibility. Under these conditions, the microstructure formed is lamellar. We find that an increase in molecular rigi…
Molecular first hyperpolarizability of push-pull polyenes: Relationship between electronic and vibrational contribution by a two-state model
In this work we present a theoretical justification, based on a two-state model, of the recently observed close resemblance between the molecular first-order hyperpolarizability (${\mathrm{\ensuremath{\beta}}}^{\mathit{e}}$) obtained with traditional experimental or theoretical methods and the vibrational (or relaxati…
Application of standard and modified Judd–Ofelt theories to a praseodymium-doped fluorozirconate glass
A method which takes into account normalized oscillator strengths is detailed for the calculation of parameters in Judd–Ofelt theory (B. R. Judd, Phys. Rev. 127, 750 (1962), G. S. Ofelt, J. Chem. Phys. 37, 511 (1962)). In the case of a Pr3+-doped fluorozirconate glass, the Judd–Ofelt parameters obtained in this way do…
Structural and spectroscopic investigations of CdS/HgS/CdS quantum-dot quantum wells
Epitaxial growth in a CdS/HgS heterostructure of nanometer dimensions, prepared by methods of wet chemistry, is demonstrated. High-resolution transmission-electron microscopy is used to determine the shape and crystallinity of this system consisting of a quantum well in a quantum dot. The homogeneous absorption and fl…
Cathodoluminescence study of ArF excimer laser-induced planarization of large grain diamond films
Planarization of large grain diamond films has been induced by 193 nm excimer laser irradiation. Secondary emission images and cathodoluminescence (CL) in the scanning electron microscope have been used to characterize the irradiated area. Irradiation causes changes in the structure of defects involving nitrogen and v…
Optical Absorption in Band-Edge Region of (CH3NH3)3Bi2I9Single Crystals
Optical absorption spectra were measured around the band edge in ( CH 3 NH 3 ) 3 Bi 2 I 9 single crystals. In the very thin crystals, an intrinsic exciton band appears clearly at 2.51 eV at low temperatures, and the absorption peak remains even at room temperature reflecting a large binding energy of more than 300 meV…