A5017977887- Electron and X-Ray Spectroscopy Techniques
- Surface and Thin Film Phenomena
- Advanced Chemical Physics Studies
- Semiconductor materials and devices
- Conducting polymers and applications
- Semiconductor materials and interfaces
- Analytical Chemistry and Sensors
- Semiconductor Quantum Structures and Devices
- Prostate Cancer Treatment and Research
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Materials Characterization Techniques
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Electrochemical Analysis and Applications
- Transition Metal Oxide Nanomaterials
- Organic Electronics and Photovoltaics
- High Altitude and Hypoxia
- Spectroscopy and Quantum Chemical Studies
- Photochemistry and Electron Transfer Studies
- Advanced Semiconductor Detectors and Materials
- Chemical and Physical Properties of Materials
- Photochromic and Fluorescence Chemistry
- Advanced Physical and Chemical Molecular Interactions
- Surface Roughness and Optical Measurements
- X-ray Diffraction in Crystallography
Yale University
2017-2021
University of Tennessee Health Science Center
2009-2017
Ducks Unlimited
2016
University of Tennessee at Knoxville
2008-2016
Memphis Health Center
2016
University of Rochester
1974-2015
Xerox (United States)
1989-2015
University of Memphis
2006-2014
The Ohio State University
2010
Xerox (France)
1974-2009
This major eight-volume reference work provides the first unified treatment of an important interdisciplinary field.
1. Introduction: Characteristic Features of Organic Molecular Crystals.- 1.1 Interaction Forces in 1.2 The Atom-Atom Potential Method.- 1.3 Aromatic Hydrocarbons - Model Compounds 1.3.1 Anthracene.- Anthracene as Compound.- Structure.- Basic Parameters.- Crystal Elastic and Optical Properties.- Metastable Phases 1.3.2 Naphthalene.- 1.3.3 Higher Linear Polyacenes.- Tetracene Pentacene.- Hexacene.- 1.3.4 Other Compounds.- 1.4 Specific Properties Electronic States a Crystal.- 1.5...
Extension of analyses low-energy-electron-diffraction intensities to encompass structure determination low-index semiconductor surfaces reveals that GaAs(110) is reconstructed. The As atoms protrude from the surface whereas Ga are displaced inward such no nearest-neighbor bond lengths altered.
X-ray and ultraviolet photoelectron spectroscopy (XPS UPS) have been used in a study of the electronic structure iodine-doped polyacetylene. Core level valence band spectra are to assess nature consequences fo iodine doping. The compared with our previous results on pure AsF5-doped polyacetylene, other published work
The ultraviolet photoemission and optical absorption spectra of pyrrole polypyrrole are analyzed using the spectroscopically parametrized CNDO/S3 model. Calculated charge densities, bond orders, orbital eigenvalues for compared with extensive literature on this molecule. densities valence states computed pyrrole, oligomers an infinite planar chain. They provide a good description electron measured gas-phase condensed thin films thin-film polypyrrole. photogenerated radical cation in seem to...
The interpretation of contact-charge-exchange experiments using polymers requires the existence electronic states contiguous to Fermi energies contacting metals. atomic and relaxations, both molecular moiety on which charge is localized surrounding polymer matrix, combine provide suitable intrinsic states.
An explicit model of contact-charge exchange in polymers is proposed which the steady-state exchanged charge resides intrinsic molecular-ion states. The eigenvalue spectra these states are inferred from metal/polymer measurements using a theoretical formalism constructed for this purpose. This extended to encompass description polymer/polymer as well. Utilizing contact-charge-exchange input data, predicts correctly both sign and order magnitude measured between polystyrene copolymers styrene...
A spectroscopic characterization of poly(2-vinyl pyridine) is presented for the purpose utilizing this material as a test case to examine validity new theory electronic structure saturated-chain pendant-group polymers. In theory, which we refer molecular-ion model, low-energy excitations polymer are regarded (charge injection) or molecular-exciton (absorption electromagnetic radiation) states associated with moieties. These modified in relative corresponding gas-phase molecular moieties by...
Experimental low-energy-electron-diffraction (LEED) intensity profiles from the (100), (110), and (111) faces of clean aluminum are analyzed using a version inelastic-collision model which incorporates effects both lattice vibrations "realistic" electron-ion-core potential as described by its $l\ensuremath{\le}2$ partial-wave phase shifts. The data consists specular nonspecular beams in energy range 0-180 eV for angles incidence between 0\ifmmode^\circ\else\textdegree\fi{}...
The x-ray and ultraviolet photoemission spectra of undoped polyacetylene, AsF5-doped AsF5, AsF3 are reported compared. At a doping level near where the electrical conductivity saturates (∼11% AsF5), As:F ratio is 1:5 large fraction arsenic–fluoride moieties localized surface polyacetylene fibrils. C (1s) core-level indicate charge transfer about one electron per AsF5 molecule. UPS spectra, induced Auger CNDO calculations suggest, however, that arsenic pentafluoride not simple AsF5-radical...
Observation of a new phenomenon, the reversible change in sign charge transferred to polymer upon sequential contacts with series metals, is reported. This observation interpreted using model which attributes charges occurrence local intrinsic molecular-ion states. A phenomenological representation both these states and metal/polymer contact exchange process developed. The validity this phenomenology tested by comparing its predictions systematic study charging poly(styrene), poly(methyl...
Transient photoconductivity has been used to measure the electron drift mobility in ${c}^{\ensuremath{'}}$ direction of single-crystal naphtalene from 54 324 K. Below 100 K rises exponentially with decreasing temperature, an effect which we attribute onset band-type motion limited by optical-phonon scattering. This observation allows identification approximately constant at higher temperatures ($T>100$ K) hopping localized charge carriers.
A diagrammatic version of perturbation theory is developed for the description influence lattice vibrations on elastic and inelastic scattering cross sections low-energy electrons from surfaces single-crystal solids. The formalism describes effects a thermodynamic-equilibrium distribution both bulk surface phonon modes. relationships between our general conventional single-scattering analysis electron-solid are displayed. Multiple-scattering virtual-phonon emission given ion core included in...
The evaluation of the elastic scattering differential cross section electron from a planar surface vibrating lattice is reduced to solution set coupled algebraic equations for associated amplitude. This reduction valid both overlapping potentials (thus removing restriction previous analyses muffin-tin potentials) and nonspherical with ion cores at solid surfaces. are solved using double-diffraction analysis inelastic-collision model. Surface scatterers taken be geometrically equivalent but...
We present a unified quantitative explanation of the temperature dependence drift mobilities photoinjected electrons in naphthalene for all directions and temperatures. The theory proposed is based on polaronic description charge carriers calculational scheme employs site-local states. Excellent agreement experiment occurs known reasonable parameters.
The atomic geometries and electronic structures of the cleavage faces, (101\ifmmode\bar\else\textasciimacron\fi{}0) (112\ifmmode\bar\else\textasciimacron\fi{}0), wurtzite-structure CdS CdSe are calculated using an ${\mathrm{sp}}^{3}$ tight-binding model. model is validated by comparison with bulk optical x-ray photoemission data. perpendicular displacement top-layer anion relative to corresponding cation, ${\ensuremath{\Delta}}_{1}$,\ensuremath{\perp}, predicted be 0.72 A\r{} (CdS) 0.77...
A microscopic quantum theory of the scattering an electron at metal-vacuum interfaces is constructed. The interactions with short-range electron-ion core potential, bulk-density fluctuations (e.g., plasmons), and induced surface charge all are incorporated into in a systematic fashion. Models surface- bulk-charge-density catalogued as appropriate limiting cases theory. structure predictions various models compared, suitability basis electron-solid examined. approximations required to produce...
The dependence on beam energy and lattice geometry of the intensity electrons diffracted from surfaces is evaluated using inelastic-collision model. At energies below that second primary Bragg peak, qualitative features profiles are related to geometry. quantitative depend sensitively scattering surface layer. first detailed interpretation such proposed for (100) face tungsten.
Androgen receptor (AR) mediates the growth of prostate cancer throughout its course development, including in abnormal splice variants (AR-SV)-driven advanced stage castration-resistant disease. AR stabilization by androgens makes it distinct from other steroid receptors, which are typically ubiquitinated and degraded proteasomes after ligand binding. Thus, targeting requires development agents that can sustainably degrade variant isoforms for effective therapy. Here we report discovery...