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ANHARMONIC POTENTIAL CONSTANTS AND THEIR DEPENDENCE UPON BOND LENGTH

Description: Empirical study of cubic and quartic vibrational force constants for diatomic molecules shows them to be approximately exponential functions of internuclear distance. A family of curves is obtained, determined by the location of the bonded atoms in rows of the periodic table. Displacements between successive curves correspond closely to those in Badger's rule for quadratic force constants (for which the parameters are redetermined to accord with all data now available). Constants for excited el… more
Date: August 1, 1961
Creator: Herschbach, D.R. & Laurie, V.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Theoretical study of the structure, energetics, and dynamics of silicon and carbon systems using tight-binding approaches

Description: Semiempirical interatomic potentials are developed for silicon and carbon by modeling the total energy of the system using tight-binding approaches. The parameters of the models were obtained by fitting to results from accurate first-principles Local Density Functional calculations. Applications to the computation of phonons as a function of volume for diamond-structured silicon and carbon and the thermal expansions for silicon and diamond yields results which agree well with experiment. The ph… more
Date: October 25, 1991
Creator: Xu, Chunhui.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Physics Division Summary Report

Description: The use and operation of the 4.5-Mev Van de Graaff generator ts descrtbed. Sputtering experiments were conducted by bombarding single crystals of electrolytic copper wtth deuterons with energies of 0.8 to 2.5 Mev. The experimental results are discussed on the basis of existing sputtering theories. The kinetic-energy distribution and Boltzmann "temperatures" of most of the fragments of cyanogen under electron impact were determined. A lower limit of 0.05 ev for this temperature'' was also determ… more
Date: January 1, 1962
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radiation effects and metalloproteins studied by x-ray photoelectron spectroscopy

Description: X-ray photoelectron spectroscopy (XPS) is used to study the bonding structure at the iron site of cytochrome c and the bonding of rare earth ions to the phosphate oxygens of ATP. Radiation effects are studied on several amino acid and simple peptide model systems. The emission spectrum of the x-ray source is calculated from literature references. The distributions of photon energy as a function of photon frequency and as a function of take-off angle are obtained. From these distributions, the r… more
Date: July 1, 1975
Creator: Wurzbach, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Combined electrochemical/surface science investigations of Pt/Cr alloy electrodes

Description: Chromium addition improves the performance of carbon-supported Pt electrodes for oxygen reduction in phosphoric acid fuel cells. To clarify the role of chromium and its chemical nature at the electrode surface, we have performed a combined electrochemical/surface science investigation of a series of bulk Pt/sub x/Cr/sub (1-x)/ alloys (0 less than or equal to x less than or equal to 1). In this paper we report the surface characterization of the starting electrodes by XPS, electrochemical result… more
Date: January 1, 1985
Creator: Daube, K. A.; Paffett, M. T.; Gottesfeld, S. & Campbell, C. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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THEORETICAL STUDY OF OPTICAL PROPERTIES. PHOTON ABSORPTION COEFFICIENTS, OPACITIES, AND EQUATIONS OF STATE OF LIGHT ELEMENTS INCLUDING THE EFFECT OF LINES. Final Report. APPENDIX A: THERMODYNAMIC PROPERTIES AND MEAN OPACITIES

Description: Photon absorption coefficients and mean opacities were calculated for hydrogen, beryllium, carbon, nitrogen, aluminum, and silicon over a temperature range froni l.5 to 34 ev and a density range from about l0/sup -1/g/cm/sup 3/ downward. Contributions to the absorption coefficient from free-free (inverse- bremsstrahlung), bound-free (photoelectric), and bound-bound (line-absorption) processes are included, as is Compton scattering. Certain thermodynamic properties are also given. An improved re… more
Date: September 1, 1961
Creator: Stewart, J.C. & Pyatt, K.D. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Microscopic calculations of nuclear structure and nuclear correlations

Description: A major goal in nuclear physics is to understand how nuclear structure comes about from the underlying interactions between nucleons. This requires modelling nuclei as collections of strongly interacting particles. Using realistic nucleon-nucleon potentials, supplemented with consistent three-nucleon potentials and two-body electroweak current operators, variational Monte Carlo methods are used to calculate nuclear ground-state properties, such as the binding energy, electromagnetic form factor… more
Date: January 1, 1992
Creator: Wiringa, R.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Few-body binding energy correlations

Description: The effect of strongly linear few-nucleon binding energy correlations under variation of the potential has been found by the authors in the three-nucleon case. Their previous work is sketched as a basis for giving several extensions in the present note. Under realistic conditions there is a weak energy dependence for the kernels of the separable approximated Alt-Grassberger-Sandhas equations. The first-order correction E/sub T//sup 1/ is smaller for the Gauss potential than for the Yamaguchi; t… more
Date: January 1, 1980
Creator: Kroeger, H. & Perne, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Phase Transformations in Alumina. Technical Report, May to December 1961

Description: e transformation studies showed that synthetic aluminas produced in the laboratory were not transformed to alpha alumina at 400 to 700' deg n the presence of nitric acid and water vapor. Amorphous aluminn produced in the pilot plant was transformed to alpha alumina. This indicated that the amorphous alumina produced in the pilot plant is structurally predisposed to form alpha alumina. Most additives did not appear to have any special effects. Lithium formed zeta alumina, LiAl/sub 5/O/sub 8/. Ph… more
Date: December 1, 1961
Creator: Eding, H J; Huggins, M L & Brown, A G
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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(Ionization in liquids)

Description: This document describes charge transport following ionization of model liquids and how this process may be important in carcinogenesis. 15 refs., 2 figs., 4 tabs. (MHB)
Date: January 1, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigations of the potential functions of weakly bound diatomic molecules and laser-assisted excitive Penning ionization

Description: Three variations on the Dunham series expansion function of the potential of a diatomic molecule are compared. The differences among these expansions lie in the choice of the expansion variable, lambda. The functional form of these variables are lambda/sub s/ = l-r/sub e//r for the Simon-Parr-Finlan version, lambda/sub T/ - 1-(r/sub e//r)/sup p/ for that of Thakkar, and lambda/sub H/ = 1-exp(-rho(r/r/sub e/-1) for that of Huffaker. A wide selection of molecular systems are examined. It is found… more
Date: May 1, 1982
Creator: Goble, J.H. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A = 4 0/sup +/ - 1/sup +/ binding-energy difference

Description: The A = 4 ..lambda..-hypernuclei provide a rich source of information about the s-wave properties of the fundamental hyperon-nucleon (YN) force as well as offer a unique opportunity to investigate the complications that arise in calculations of the properties of bound systems in which one baryon (here the ..lambda..) with a given isospin couples strongly to another (the ..sigma..) with a different isospin. The ..lambda../sup 4/H - ..lambda../sup 4/He isodoublet ground-state energies are not con… more
Date: January 1, 1982
Creator: Gibson, B. F. & Lehman, D. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermodynamic Implications of Band Structure Effects for Rare Gases on Graphite

Description: Recent analyses of atomic beam scattering data have suggested that an anisotropic He-C pair interaction is appropriate to the problem of He on graphite. This results in considerably more corrugated equipotential surfaces than previously assumed, and correspondingly manifest band structure effects. These have been observed for He/graphite in the specific heat for temperature T > 3/sup 0/K. The implications for other gases and temperatures and for the effective adatom-adatom interaction are discu… more
Date: January 1, 1980
Creator: Carlos, W. E.; Cole, M. W.; Rauber, S.; Vidali, G.; Silva-Moreira, A. F.; Codona, J. L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Kinetic and equilibrium measurements of coal drying

Description: The retention, attachment, and release of water (sorption, adsorption, and desorption) in Fruitland subbituminous coal are shown to be very complex phenomena. The vapor pressure and thermodynamic activity of water in the coal at about 315 K vary sharply with composition. Removal of 60% of the water initially present reduces the vapor pressure by about 60%. The total moisture content of saturated coal also varies with temperature. A 10 K rise in temperature reduces the sorbed water by about 8%. … more
Date: January 1, 1980
Creator: Heller, A. & Elliott, G.R.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Secondary Isotope Effects in Molecular Structure

Description: A study was made to determine whether secondary iso tope effects also occur in molecular structure. Electron diffraction studies were carried out on ethane and deuteroethane. In C/sub 2/H/sub 6/ the mean C-C and C-H bond lengths found agreed very closely with values determined for other paraffin hydrocarbons, and the C--H bond showed a normal primary isotope effect (~ 0.005 A) similar to that found in methane when H is replaced by O. The output of the leastsquares analysis suggested that the me… more
Date: June 15, 1962
Creator: Bartell, L. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Shell-Model Calculations of Nuclear-Charge Radii

Description: Shell-model calculations of charge radius differences in the Pb isotopes are discussed. Core quadrupole oscillations are found to be significant factors in the calculations. Existing data on the /sup 210/Pb isotope shift and the B(E2) strengths in /sup 210/Pb are shown to be inconsistent. Ground-state correlation effects in light nuclei (i.e., 0 and Ca isotopes) introduce odd-even staggering effects and other qualitative features in agreement with existing data.
Date: January 1, 1982
Creator: McGrory, J. B. & Brown, B. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ecology of subtropical, shallow water environments: chemistry of copper and chlorine introduced into marine systems during energy production. Progress report, October 1, 1979-September 30, 1980

Description: Research progress is reported in three areas. The first area concerns the chromatography of copper organic complexes. This work is a continuation of study from previous contract years. The second concerns the use of chemical degradation experiments to determine the nature of the binding sites for copper. The third area concerns the investigation of various separation methods with the aim of separating the copper chelating substances from the remaining organic matter.
Date: January 1, 1980
Creator: Carpenter, J.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Systematics of neutron-induced fission cross sections over the energy range 0. 1 through 15 MeV, and at 0. 0253 eV

Description: Recent studies have shown straightforward systematic behavior as a function of constant proton and neutron number for neutron-induced fission cross sections of the actinide elements in the incident-neutron energy range 3 to 5 MeV. In this report, the second in a series, fission cross-section values are studied over the MeV incident-neutron energy range, and at 0.0253 eV. Fission-barrier heights and neutron-binding energies are correlated by constant proton and neutron number; however, these sys… more
Date: November 11, 1977
Creator: Behrens, J.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Energies and bonding in manganese phosphides. Annual progress report, July 1, 1979-June 30, 1980

Description: Manganese monophosphide and other first row transition metal phosphides have been studied by x-ray photoelectron spectroscopy in collaboration with colleagues at Ames Laboratory. Electron binding energies of both valence-conduction band and core level electrons show an evolution of metallic behavior in the series ScP, TiP, VP, MnP, FeP, and in the series FeP, Fe/sub 2/P, Fe/sub 3/P. Phosphorus dissociation pressure measurements on MnP lead to: 4MnP/sub (s)/ = 2Mn/sub 2/P/sub (s)/ + P/sub 2//sub… more
Date: March 1, 1980
Creator: Myers, C. E.; Jung, E. D.; Simpson, D. J.; Patterson, E. L. & Melzer, J. I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pigment-protein complexes

Description: The photosynthetically-active pigment protein complexes of procaryotes and eucaryotes include chlorophyll proteins, carotenochlorophyll proteins, and biliproteins. They are either integral components or attached to photosynthetic membranes. Detergents are frequently required to solubilize the pigment-protein complexes. The membrane localization and detergent solubilization strongly suggest that the pigment-protein complexes are bound to the membranes by hydrophobic interactions. Hydrophobic int… more
Date: January 1, 1980
Creator: Siegelman, H W
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Binding energies of hypernuclei and. lambda. -nuclear interactions

Description: Variational Monte Carlo calculations have been made for the s-shell hypernuclei and also of /sup 9/Be hypernuclei with a 2..cap alpha.. + ..lambda.. model. The well depth is calculated variationally with the Fermi hypernetted chain method. A satisfactory description of all the relevant experimental ..lambda.. separation energies and also of the ..lambda..p scattering can be obtained with reasonable TPE ..lambda..N and ..lambda..NN forces and strongly repulsive dispersive ..lambda..NN forces whi… more
Date: January 1, 1985
Creator: Bodmer, A. R. & Usmani, Q. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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