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Articles 31 - 60 of 62
Full-Text Articles in Physical Sciences and Mathematics
A Trip To The Beginning Of The Universe With The Large Hadron Collider, Stefan M Spanier
A Trip To The Beginning Of The Universe With The Large Hadron Collider, Stefan M Spanier
Physics and Astronomy Publications and Other Works
Slides from a presentation given at the Science Forum of the University of Tennessee. It discusses the physics program of the Large Hadron Collider in general terms. Serves as introductory material to the field.
Direct Observation Of H2 Binding To A Metal Oxide Surface, J. Z. Larese, T. Arnold, L. Frazier, R. J. Hinde, A. J. Ramirez-Cuesta
Direct Observation Of H2 Binding To A Metal Oxide Surface, J. Z. Larese, T. Arnold, L. Frazier, R. J. Hinde, A. J. Ramirez-Cuesta
Chemistry Publications and Other Works
Inelastic neutron scattering is used to probe the dynamical response of H2 films adsorbed on MgO(100) as a function of film thickness. Concomitant diffraction measurements and a reduced-dimensionality quantum dynamical model provide insight into the molecule-surface interaction potential. At monolayer thickness, the rotational motion is strongly influenced by the surface, so that the molecules behave like quasiplanar rotors. These findings have a direct impact on understanding how molecular hydrogen binds to the surface of materials used in catalytic and storage applications.
Cross Sections Fall 2008, Department Of Physics And Astronomy
Cross Sections Fall 2008, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Spring 2008, Department Of Physics And Astronomy
Cross Sections Spring 2008, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
A Six-Dimensional H2–H2 Potential Energy Surface For Bound State Spectroscopy, Robert Hinde
A Six-Dimensional H2–H2 Potential Energy Surface For Bound State Spectroscopy, Robert Hinde
Chemistry Publications and Other Works
We present a six-dimensional potential energy surface for the (H2)2 dimer based on coupled-cluster electronic structure calculations employing large atom-centered Gaussian basis sets and a small set of midbond functions at the dimer’s center of mass. The surface is intended to describe accurately the bound and quasibound states of the dimers (H2)2, (D2)2, and H2–D2 that correlate with H2 or D2 monomers in the rovibrational levels (v, j) =(0,0), (0,2), (1,0), and (1,2). We employ a close-coupled approach to compute the …
Cross Sections Fall 2007, Department Of Physics And Astronomy
Cross Sections Fall 2007, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Spring 2007, Department Of Physics And Astronomy
Cross Sections Spring 2007, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Secondary Neutron-Production Cross Sections From Heavy-Ion Interactions Between 230 And 600 Mev/Nucleon, Lawrence H Heilbronn
Secondary Neutron-Production Cross Sections From Heavy-Ion Interactions Between 230 And 600 Mev/Nucleon, Lawrence H Heilbronn
Faculty Publications and Other Works -- Nuclear Engineering
Secondary neutron-production cross-sections have been measured from interactions of 230 MeV/nucleon He, 400 MeV/nucleon N, 400 MeV/nucleon Kr, 400 MeV/nucleon Xe, 500 MeV/nucleon Fe, and 600 MeV/nucleon Ne interacting in a variety of elemental and composite targets. We report the double-differential production cross sections, angular distributions, energy spectra, and total cross sections from all systems. Neutron energies were measured using the time-of-flight technique, and were measured at laboratory angles between 5° and 80°. The spectra exhibit behavior previously reported in other heavy-ion-induced neutron production experiments; namely, a peak at forward angles near the energy corresponding to the beam velocity, with …
Cross Sections Fall 2006, Department Of Physics And Astronomy
Cross Sections Fall 2006, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Spring 2006, Department Of Physics And Astronomy
Cross Sections Spring 2006, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Population Size Bias In Descendant-Weighted Diffusion Quantum Monte Carlo Simulations, G. Lee Warren, Robert J. Hinde
Population Size Bias In Descendant-Weighted Diffusion Quantum Monte Carlo Simulations, G. Lee Warren, Robert J. Hinde
Chemistry Publications and Other Works
We consider the influence of population size on the accuracy of diffusion quantum Monte Carlo simulations that employ descendant weighting or forward walking techniques to compute expectation values of observables that do not commute with the Hamiltonian. We show that for a simple model system, the d-dimensional isotropic harmonic oscillator, the population size must increase rapidly with d in order to ensure that the simulations produce accurate results. When the population size is too small, expectation values computed using descendant-weighted diffusion quantum Monte Carlo simulations exhibit significant systematic biases.
Interaction-Induced Dipole Moment Of The Ar–H2 Dimer: Dependence On The H2 Bond Length, Robert J. Hinde
Interaction-Induced Dipole Moment Of The Ar–H2 Dimer: Dependence On The H2 Bond Length, Robert J. Hinde
Chemistry Publications and Other Works
We present ab initio calculations of the interaction-induced dipole moment of the Ar–H2 van der Waals dimer. The primary focus of our calculations is on the H2 bond length dependence of the dipole moment, which determines the intensities of both the collision-induced H2 = 1 ← 0 fundamental band in gaseous Ar–H2 mixtures and the dopant-induced H2 = 1 ← 0 absorption feature in Ar-doped solid H2 matrices. Our calculations employ large atom-centered basis sets, diffuse bond functions positioned between the two monomers, and a coupled cluster treatment of valence electron correlation; core-valence correlation …
Cross Sections Fall 2005, Department Of Physics And Astronomy
Cross Sections Fall 2005, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Spring 2005, Department Of Physics And Astronomy
Cross Sections Spring 2005, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Vibrational Dependence Of The H2–H2 C6 Coefficients, Robert Hinde
Vibrational Dependence Of The H2–H2 C6 Coefficients, Robert Hinde
Chemistry Publications and Other Works
We use the sum-over-states formalism to compute the imaginary-frequency dipole polarizabilities for H2, as a function of the H–H bond length, at the full configuration interaction level of theory using atom-centered d-aug-cc-pVQZ basis sets. From these polarizabilities, we obtain isotropic and anisotropic C6 dispersion coefficients for a pair of H2 molecules as functions of the two molecules’ bond lengths.
Cross Sections Fall 2004, Department Of Physics And Astronomy
Cross Sections Fall 2004, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Spring 2004, Department Of Physics And Astronomy
Cross Sections Spring 2004, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Fall 2003, Department Of Physics And Astronomy
Cross Sections Fall 2003, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Spring 2003, Department Of Physics And Astronomy
Cross Sections Spring 2003, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Infrared-Active Vibron Bands Associated With Substitutional Impurities In Solid Parahydrogen, Robert Hinde
Infrared-Active Vibron Bands Associated With Substitutional Impurities In Solid Parahydrogen, Robert Hinde
Chemistry Publications and Other Works
We present a model for the line shapes of infrared-active Q1(0) vibron bands observed in solid parahydrogen doped with low concentrations of spherical substitutional impurities. The line shapes are highly sensitive to the H2 vibrational dependence of the dopant–H2 interaction. When this vibrational dependence is strong, the dopant can trap the infrared-active vibron in its first solvation shell; in this case, the trapped vibron manifests itself in the absorption spectrum as a narrow feature to the red of the pure solid’s vibron band.
Cross Sections Fall 2002, Department Of Physics And Astronomy
Cross Sections Fall 2002, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Spring 2002, Department Of Physics And Astronomy
Cross Sections Spring 2002, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Fall 2001, Department Of Physics And Astronomy
Cross Sections Fall 2001, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Quantization Of Maximally Charged Slowly Moving Black Holes, George Siopsis
Quantization Of Maximally Charged Slowly Moving Black Holes, George Siopsis
Physics and Astronomy Publications and Other Works
We discuss the quantization of a system of slowly moving extreme Reissner-Nordström black holes. In the near-horizon limit, this system has been shown to possess an SL(2,R) conformal symmetry. However, the Hamiltonian appears to have no well-defined ground state. This problem can be circumvented by a redefinition of the Hamiltonian due to de Alfaro, Fubini, and Furlan (DFF). We apply the Faddeev-Popov quantization procedure to show that the Hamiltonian with no ground state corresponds to a gauge in which there is an obstruction at the singularities of moduli space requiring a modification of the quantization rules. The …
Cross Sections Spring 2001, Department Of Physics And Astronomy
Cross Sections Spring 2001, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Scalar Absorption By Spinning D3-Branes, George Siopsis
Scalar Absorption By Spinning D3-Branes, George Siopsis
Physics and Astronomy Publications and Other Works
We discuss absorption of scalars by a distribution of spinning D3-branes. The D3-branes are multi-center solutions of supergravity theory. We solve the wave equation in various cases of supergravity backgrounds in which the equation becomes separable. We show that the absorption coefficients exhibit a universal behavior as functions of the angular momentum quantum number and the Hawking temperature. This behavior is similar to the form of the gray-body factors one encounters in scattering by black holes. Our discussion includes the problematic case of spherically symmetric distributions of D-branes, where resonances arise. We obtain the same universal form for the absorption …
Cross Sections Fall 1999, Department Of Physics And Astronomy
Cross Sections Fall 1999, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Summer 1999, Department Of Physics And Astronomy
Cross Sections Summer 1999, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
Cross Sections Spring 1999, Department Of Physics And Astronomy
Cross Sections Spring 1999, Department Of Physics And Astronomy
Cross Sections
No abstract provided.
The He-Lih Potential Energy Surface Revisited. I. An Interpolated Rigid Rotor Surface, Robert Hinde
The He-Lih Potential Energy Surface Revisited. I. An Interpolated Rigid Rotor Surface, Robert Hinde
Chemistry Publications and Other Works
We reconsider the potential energy surface of the He–LiH system recently examined by Gianturco and co-workers [F. A. Gianturco et al., Chem. Phys. 215, 227 (1997)]. We compute the He–LiH interaction energy at the CCSD(T) level using large correlation consistent atomic basis sets supplemented with bond functions. To capture the severe anisotropy of the He–LiH potential, we interpolate our ab initio points in the angular direction with cubic splines, then expand the splines in terms of Legendre polynomials. The resulting smooth potential surface differs substantially from that of Gianturco et al.; in particular, our attractive He–LiH well is more …