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Showing 1 to 20 of 80 for “"Scattering measurements"”.
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High resolution scattering measurements for stationary particles
… not only light extinction but multi angle light scattering. Cylindrical particles scatter light in a way that can be quantified by electromagnetic wave theory. This scattering distribution is directly related to the cylinders diameter and material properties, as well as the wavelength of the …
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Hyper-Rayleigh scattering measurements of hyperpolarizabilities for tetrahedral molecules
… and methane have been measured by hyper-Rayleigh scattering in gas and liquid phases. The gas-phase results for the coefficient beta xyz (atomic units) are 11.0 +/- 0.9 (CC14), 5.4 +/- 0.4 (CF4), 7.0 +/- 0.6 (CD4), 7.1 +/- 0.7 (CH4). Ab initio calculations are consistent with the measured values …
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Inversion of Light Scattering Measurements for Particle Size and Optical Constants
Light scattering techniques have proven to be valuable tools in determining the size and optical properties of aerosol particles. Laser light scattering techniques can be used unobtrusively in harsh environments, so the development and improvement of these techniques is of great interest. The …
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New techniques in low-Q² elastic electron-proton scattering measurements and the proton radius extraction
… fm from two traditional methods, electron-proton scattering and electronic hydrogen spectroscopy. A recent electron-proton scattering experiment, PRad, measured a smaller radius but also large electric form factor values within 0.02 ≤ Q² ≤ 0.06 (GeV/c)² conflicting with previous experiments. …
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Effects of Substrate and Molecular Adsorption on Raman Scattering From Individual Single -Walled Carbon Nanotubes
… or intentional and substrate on resonance Raman scattering measurements on isolated SWCNTs. By correlating Raman scattering measurements with electronic properties of nanotubes, we show that adsorption of O2 from ambient environment leads to charge transfer (and the Fermi level shift below the …
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Neutron scattering and thermodynamic studies of quantum magnetism on the kagomé lattice
… spin-1 moments on kagome lattices using neutron scattering and thermodynamic probes. Both ferromagnetic and antiferromagnetic systems were studied. Cu(1,3-bdc) is an organometallic material, where the Cu2+ ions form a ferromagnetic S = 1/2. kagomé system. Synthesis techniques were developed to …
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Raman Scattering Studies of Aluminum-Gallium - Arsenide Based Semiconductor Superlattices (Phonons, Interfaces)
Raman scattering measurements have been made on more than twenty semiconductor superlattices, all grown by molecular beam epitaxy and based on the Al(,x)Ga(,1-x)As system. The samples consist of undoped layers with alternating values of x along the {001} direction, and have periods ranging from …
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The ground state of the spin-1/2 kagomé lattice antiferromagnet : neutron scattering studies of the zinc-paratacamite mineral family
… ZnCu3(OH)6Cl2, are studied by means of neutron scattering measurements as well as specific heat, susceptibility, and mag-netization measurements. These materials are studied to investigate the nature of the ground state of the spin-1 2 kagomé lattice antiferromagnet, as such a system is …
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Quasi-Elastic Light Scattering Diagnostics for a High Voltage Spark Discharge
Quasi-elastic light scattering was used as a diagnostic probe into analyte material transport processes in a unipolar, positionally stable, high voltage spark discharge. The material transport by particulate intermediates was studied. Instrumentation was constructed to allow spatially-, …
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Addressing process variation in aerosol jet printing and accelerating conformal electronics manufacturing
… a process monitoring technique employing light scattering measurements enabling closed-loop operation and data-rich quality control measures. Light scattering measurements have been shown successful over timescales spanning milliseconds to hours, enabling both closed-loop control and in-situ …
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X-Ray Scattering Study of the Transition Dynamics in Relaxor Ferroelectric Lead (Magnesium(1/3) Niobium(2/3)) Oxygen(3) (Pmn)
Thermal diffuse scattering measurements were performed at several temperatures. A [011] transverse optic soft mode was determined to exist. The temperature dependence of this phonon mode was carefully studied as the transition is approached, and down to 40 K. The q-dependency of the freezing …
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Light Scattering Measurement of Phospholipid Microvesicle Membrane Fusion Kinetics
… function, as measured by quasi-elastic light scattering and Koppel's method of cumulants, are expressed in terms of moments of the size density function of single-walled hollow spherical scatterers. An equation governing the evolution of fusing particles is derived and solved for simple cases. …
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Effects of Background Ions on Polyethersulfone (Pes) Membrane Fouling by Natural Organic Matter (Nom)
… was experimentally evaluated by dynamic light scattering measurements with SRNOM. These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of supramolecular NOM …
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The microstructure of confined and thin polymer films
… neutron and X-ray sources, surface and interface scattering methods became feasible techniques for structure studies. Due to the experimental difficulties a successful setup for scattering experiments on confined films with thicknesses of about a few hundreds of Angstroms is still not available. …
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Probing the Dynamics of Pressure- and Magnetic Field -Tuned Transitions in Strongly-Correlated Electron Systems: Raman Scattering Studies
Third, I present Raman scattering measurements of (Eu,Gd)O and (Eu,La)B 6 as functions of doping, B isotope, magnetic field, and temperature. Our results reveal a variety of distinct regimes as a function of decreasing T: (i) a paramagnetic semimetal regime, characterized by a collision-dominated …
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Optical studies of GaAs:C grown at low temperature and of localized vibrations in normal GaAs:C
… infrared transmission, and Raman scattering measurements. The photoluminescence experiments show that in LT-GaAs:C films grown at temperatures below 400 °C, nonradiative recombination processes dominate and photoluminescence is quenched. When the growth temperature exceeds 400 °C, …
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Raman scattering in free standing porous Si films
In this thesis, Raman Scattering of free standing porous silicon on sapphire samples of controllably varying porosity is studied. The free standing, fully crystalline porous silicon films were prepared by electrochemical etching and the porous structure were lifted-off by a procedure based on …
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Multi-Resolution Techniques Based on Shape-Optimization for the Solution of Inverse-Scattering Problems
In the framework of inverse electromagnetic scattering techniques, the thesis focuses on the development and the analysis of the integration between a multi-resolution imaging procedure and a shape-optimization-based technique. The arising methodology allows, on one hand, to fully exploit the …
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Neutron scattering and magnetization studies of the spin correlations on the kagomé lattice antiferromagnet KFe₃(Oh)₆(SO₄)₂
… with the Z2 symmetry. Depending on which measurements are performed, the critical behavior of the system can belong to either SO(2) or Z2 universality classes with two distinct critical temperatures; one is associated with the spontaneous breaking of the Z2 symmetry, and the other …
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