ZnS Core-Shell Quantum Dots
... kV to obtain high-resolution images of individual quantum dots. An objective aperture was used to selectively image the (100), (002), and (101) wurtzite lattice planes. The samples were prepared by placing one drop of a dilute solution of dots in octane onto a copper grid supporting a thin film of a ...
... kV to obtain high-resolution images of individual quantum dots. An objective aperture was used to selectively image the (100), (002), and (101) wurtzite lattice planes. The samples were prepared by placing one drop of a dilute solution of dots in octane onto a copper grid supporting a thin film of a ...
Understanding Microstructural Evolution in Mixed Metal
... of protonation of alkoxide and hydroxide groups cannot be determined, while the proton exchange is much faster than the NMR-resonance decay. The measured chemical shift is simply the average of protonated and nonprotonated species. Increase of the hydrolysis ratio involves an increase of the hydroly ...
... of protonation of alkoxide and hydroxide groups cannot be determined, while the proton exchange is much faster than the NMR-resonance decay. The measured chemical shift is simply the average of protonated and nonprotonated species. Increase of the hydrolysis ratio involves an increase of the hydroly ...
Crystal structure of Ni-sorbed synthetic vernadite: a powder X
... series of analogues of vernadite (d-MnO2) were prepared with Ni/Mn atomic ratios of 0.002 0.105 at pH4 and 0.002 0.177 at pH 7. Their structures were characterized using X-ray powder diffraction (XRD). The d-MnO2 nano-crystals are essentially monolayers with coherent scattering domains sizes of ~10 ...
... series of analogues of vernadite (d-MnO2) were prepared with Ni/Mn atomic ratios of 0.002 0.105 at pH4 and 0.002 0.177 at pH 7. Their structures were characterized using X-ray powder diffraction (XRD). The d-MnO2 nano-crystals are essentially monolayers with coherent scattering domains sizes of ~10 ...
Light Scattering of Semiconducting Nanoparticles
... the exciting visible laserlight are about 2.5 eV (corresponding to the wavelength L ≈ 500 nm). Therefore, from Eq. (1) we get S ≈ L and the wavevector in a typical backscat ≈ 4n/L and tering experiment will be on the order of q much smaller than the wavevector q = 2/a at the boundary of the ...
... the exciting visible laserlight are about 2.5 eV (corresponding to the wavelength L ≈ 500 nm). Therefore, from Eq. (1) we get S ≈ L and the wavevector in a typical backscat ≈ 4n/L and tering experiment will be on the order of q much smaller than the wavevector q = 2/a at the boundary of the ...
Fe(III) (Oxy)hydroxide Compositional Series
... systems and are also industrially important as precursors for materials and catalyst synthesis. However, direct characterization of the atomic arrangements of these materials is complicated because of their amorphous X-ray properties. This study involves synthesis of the complete Cr(III)-Fe(III) (ox ...
... systems and are also industrially important as precursors for materials and catalyst synthesis. However, direct characterization of the atomic arrangements of these materials is complicated because of their amorphous X-ray properties. This study involves synthesis of the complete Cr(III)-Fe(III) (ox ...
Application of inelastic X-ray scattering to the
... at THz frequencies. For geophysics, such high frequencies have the interest of getting close to the infinite frequency limit, in complementarity with the low frequency limit provided by radial X-ray diffraction modeling. IXS has more potential in ultra-high pressure geophysics (e.g. lower mantle and ...
... at THz frequencies. For geophysics, such high frequencies have the interest of getting close to the infinite frequency limit, in complementarity with the low frequency limit provided by radial X-ray diffraction modeling. IXS has more potential in ultra-high pressure geophysics (e.g. lower mantle and ...
Quantum Energy Regression using Scattering Transforms
... several permutations of its Coulomb matrix. The final predicted energy is then the average of the predicted energy for each permutation. While this technique improves performance, the data augmentation can significantly increase the size of the data set. In the context of kernel ridge regression, wh ...
... several permutations of its Coulomb matrix. The final predicted energy is then the average of the predicted energy for each permutation. While this technique improves performance, the data augmentation can significantly increase the size of the data set. In the context of kernel ridge regression, wh ...
Multipolarization Dynamic Light Scattering of Nonspherical
... proposed. The application to Au and Fe2O3 nanorods, in particular to monitor the selective etching-induced size changing, is described. In comparison with depolarized DLS, the method allows one to avoid measurement of the very weak cross-polarized component of the scattered light, and gives more dat ...
... proposed. The application to Au and Fe2O3 nanorods, in particular to monitor the selective etching-induced size changing, is described. In comparison with depolarized DLS, the method allows one to avoid measurement of the very weak cross-polarized component of the scattered light, and gives more dat ...
Introduction to Neutron Scattering
... Formally, the process has to be described in terms of the wavefunctions of the neutron and the nucleus. Fortunately the results of this calculation can be understood without going into all of the details involved. It is useful, though, to be able to switch to and fro between thinking about the wavef ...
... Formally, the process has to be described in terms of the wavefunctions of the neutron and the nucleus. Fortunately the results of this calculation can be understood without going into all of the details involved. It is useful, though, to be able to switch to and fro between thinking about the wavef ...
Oriented double gyroid films via roll casting
... both non-solvents for the polymer, is sprayed along the cut between the polymer film and the steel surface in order to facilitate removal by reducing the surface tension that the polymer has for the roller surface. The films are then flattened between two Teflon w sheets separated by a spacer, givin ...
... both non-solvents for the polymer, is sprayed along the cut between the polymer film and the steel surface in order to facilitate removal by reducing the surface tension that the polymer has for the roller surface. The films are then flattened between two Teflon w sheets separated by a spacer, givin ...
Neutron Scattering—A Non-destructive Microscope for Seeing
... How can we determine the relative positions and motions of atoms in a bulk sample of solid or liquid? Somehow we need to be able to see inside the sample with a suitable magnifying glass. It turns out that neutrons provide us with this capability. They have no charge, and their electric dipole momen ...
... How can we determine the relative positions and motions of atoms in a bulk sample of solid or liquid? Somehow we need to be able to see inside the sample with a suitable magnifying glass. It turns out that neutrons provide us with this capability. They have no charge, and their electric dipole momen ...
Obtaining structural information from the atomic pair
... and tested against an average structural model or the result of molecular dynamics simulations. This allows one to test those models, however, often a refinement of that model is desired. In this paper we will focus on two different cases: (1) The structural model contains a large number of atoms an ...
... and tested against an average structural model or the result of molecular dynamics simulations. This allows one to test those models, however, often a refinement of that model is desired. In this paper we will focus on two different cases: (1) The structural model contains a large number of atoms an ...
Significant decrease of the lattice thermal conductivity due to phonon
... processes that contribute to the thermal resistance.7 The situation is quit different in single quantum wells, which are either free standing or embedded into material with distinctively different elastic properties. Here, the phonon dispersion changes due to the phonon spatial confinement induced b ...
... processes that contribute to the thermal resistance.7 The situation is quit different in single quantum wells, which are either free standing or embedded into material with distinctively different elastic properties. Here, the phonon dispersion changes due to the phonon spatial confinement induced b ...
634_1.pdf
... Figure 5 illustrates rocking curves from Bimplanted Si following implantation with different doses ([9], top) and at a constant dose but varying post-implant anneals ([10], bottom). In the asimplanted state, B- and Si-interstitials expand the host silicon crystal structure and generate scattering at ...
... Figure 5 illustrates rocking curves from Bimplanted Si following implantation with different doses ([9], top) and at a constant dose but varying post-implant anneals ([10], bottom). In the asimplanted state, B- and Si-interstitials expand the host silicon crystal structure and generate scattering at ...
Electronic Supplementary Information (ESI) service
... 0.3 g (2.4 10-3 mol) of phenylphosphine-borane complex and 6.10-3 g (1.2 10-5 mol, 0.5 mol %) of B(C6F5)3 were dissolved into 4 mL of toluene and the resulting solution was heated at 90°C for 3h. After evaporation of the solvent under vacuum, the residue was washed with pentane (2x1 mL). The resulti ...
... 0.3 g (2.4 10-3 mol) of phenylphosphine-borane complex and 6.10-3 g (1.2 10-5 mol, 0.5 mol %) of B(C6F5)3 were dissolved into 4 mL of toluene and the resulting solution was heated at 90°C for 3h. After evaporation of the solvent under vacuum, the residue was washed with pentane (2x1 mL). The resulti ...
Enhanced backward scattering by surface plasmons on silver film Applied Physics A
... in this calculation come from (2), more general formulations than (3) including ϕ dependence [18], and Fig. 3, respectively. Two wavelengths, 633 nm and 364 nm, were employed in our measurement. The incident angle was well defined by micro-actuated rotational stage. To further verify the simulation ...
... in this calculation come from (2), more general formulations than (3) including ϕ dependence [18], and Fig. 3, respectively. Two wavelengths, 633 nm and 364 nm, were employed in our measurement. The incident angle was well defined by micro-actuated rotational stage. To further verify the simulation ...
Angle Resolved Scattering Combined with Optical Profilometry as
... wide range angles higher than 45 . In SALS type of measurements incident angle θi is close to zero and scattered ...
... wide range angles higher than 45 . In SALS type of measurements incident angle θi is close to zero and scattered ...
BJ26404407
... (LED’s) ,blue lasers ,UV detectors and high power , high temperature field effect transistors [2,3,4,5,6]. Aluminum nitride is a very interesting material because of it’s wide band gap (6.3 ev), high decomposition temperature (2400 c) chemical stability (in air up to 700 c) and good dielectric prope ...
... (LED’s) ,blue lasers ,UV detectors and high power , high temperature field effect transistors [2,3,4,5,6]. Aluminum nitride is a very interesting material because of it’s wide band gap (6.3 ev), high decomposition temperature (2400 c) chemical stability (in air up to 700 c) and good dielectric prope ...
Research Plan
... energy of thermal movement dependent. Then, the correlation function may be on the power series expanded. This, together with the tensor technique application are very likely to bring appropriate effects of the top gas molecules spectra intensities. The method, simultaneously, will allow to assess t ...
... energy of thermal movement dependent. Then, the correlation function may be on the power series expanded. This, together with the tensor technique application are very likely to bring appropriate effects of the top gas molecules spectra intensities. The method, simultaneously, will allow to assess t ...
Nitrogen Contamination in Elastic Neutron
... observed in a measurement, is when exchange gas is used in sample environment equipment. Typically helium is employed as the exchange gas because it remains mobile for thermal conduction purposes at all temperatures (if sufficient helium is present) and has a small neutron cross section. Nevertheles ...
... observed in a measurement, is when exchange gas is used in sample environment equipment. Typically helium is employed as the exchange gas because it remains mobile for thermal conduction purposes at all temperatures (if sufficient helium is present) and has a small neutron cross section. Nevertheles ...
SCATTERING OF ELECTRONS BY DIATOMIC MOLECULES IN
... problem of electron scattering by a hydrogen atom. We could use also other values of these parameters, for example, those calculated from the experimentally obtained potential curves for H; and H2 • Curves III and IV show the experimental results obtained by the Ramsauer method[ 9 J and by the elect ...
... problem of electron scattering by a hydrogen atom. We could use also other values of these parameters, for example, those calculated from the experimentally obtained potential curves for H; and H2 • Curves III and IV show the experimental results obtained by the Ramsauer method[ 9 J and by the elect ...
Cold encounters: Electrons and molecules
... How does the incoming electron appear to the target molecule, and how does the molecule appear to the electron? Because of the wave nature of the cold electron, it is spread out in space and the incoming wave explores a superposition ofpaths, rather than a well-defined classical path. Each path with ...
... How does the incoming electron appear to the target molecule, and how does the molecule appear to the electron? Because of the wave nature of the cold electron, it is spread out in space and the incoming wave explores a superposition ofpaths, rather than a well-defined classical path. Each path with ...
NEARLab_brochure.
... Research Spotlight: Ocean Bottom Profiling There are a number of applications – such as marine habitat monitoring, mine detection, and Navy sonar operation - in which the profile of the ocean bottom is required. However, this information is generally difficult to obtain and prone to inaccuracy. One ...
... Research Spotlight: Ocean Bottom Profiling There are a number of applications – such as marine habitat monitoring, mine detection, and Navy sonar operation - in which the profile of the ocean bottom is required. However, this information is generally difficult to obtain and prone to inaccuracy. One ...
Orbital orientation of the 4f ground state in CeCu2Si2 - SPring-8
... (see Fig. 1). However, as the wave functions cannot be calculated ab initio, they have to be determined experimentally. Single crystal magnetization measurements, inelastic neutron scattering and more recently also soft X-ray absorption spectroscopy at the M 4,5 edges (3d → 4 f ) have been very succ ...
... (see Fig. 1). However, as the wave functions cannot be calculated ab initio, they have to be determined experimentally. Single crystal magnetization measurements, inelastic neutron scattering and more recently also soft X-ray absorption spectroscopy at the M 4,5 edges (3d → 4 f ) have been very succ ...
Biological small-angle scattering
Small-angle scattering is a fundamental method for structure analysis of materials, including biological materials. Small-angle scattering allows one to study the structure of a variety of objects such as solutions of biological macromolecules, nanocomposites, alloys, synthetic polymers, etc. Small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) are the two complementary techniques known jointly as small-angle scattering (SAS). SAS is an analogous method to X-ray and neutron diffraction, wide angle X-ray scattering, as well as to static light scattering. In separation to the other X-ray and neutron scattering methods, SAS yields information on the sizes and shapes of both crystalline and non-crystalline particles. When used to study biological materials, which are very often in aqueous solution, the scattering pattern is orientation averaged. SAS patterns are collected at very small angles (a few degrees). SAS is capable of delivering structural information in the resolution range between 1 and 25 nm, and of repeat distances in partially ordered systems of up to 150 nm in size. Ultra small-angle scattering (USAS) can resolve even larger dimensions. The grazing-incidence small-angle scattering (GISAS) is a powerful technique for studying of biological molecule layers on surfaces.In biological applications SAS is used to determine the structure of a particle in terms of average particle size and shape. One can also get information on the surface-to-volume ratio. Typically, the biological macromolecules are dispersed in a liquid. The method is accurate, mostly non-destructive and usually requires only a minimum of sample preparation. However, biological molecules are always susceptible to radiation damage.Conceptually, small-angle scattering experiments are simple: the sample is exposed to X-rays or neutrons and the scattered radiation is registered by a detector. As the SAS measurements are performed very close to the primary beam (""small angles""), the technique needs a highly collimated or focused X-ray or neutron beam. The biological small-angle X-ray scattering is often performed at synchrotron radiation sources, because biological molecules normally scatter weakly and the measured solutions are dilute. The biological SAXS method profits from the high intensity of X-ray photon beams provided by the synchrotron storage rings. The X-ray or neutron scattering curve (intensity versus scattering angle) is used to create a low-resolution model of a protein, shown here on the right picture. One can further use the X-ray or neutron scattering data and fit separate domains (X-ray or NMR structures) into the ""SAXS envelope"".In comparison to other structure determination methods, such as solution NMR or X-ray crystallography, SAS allows one to overcome some restraints. For example, solution NMR is limited to protein size, whereas SAS can be used for small molecules as well as for large multi-molecular assemblies. Solid-State NMR is still an indispensable tool for determine atomic level information of macromolecules greater than 40 kDa or non-crystalline samples such as amyloid fibrils. Structure determination by X-ray crystallography may take several weeks or even years, whereas SAS measurements take days. However, with SAS it is not possible to measure the positions of the atoms within the molecule.