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  Partner: UNT College of Arts and Sciences
 Decade: 1990-1999
K-shell x-ray-production cross sections in 6C, 8O, 9F, 11Na, 12Mg, and 13Al, by 0.75- to 4.5-MeV protons

K-shell x-ray-production cross sections in 6C, 8O, 9F, 11Na, 12Mg, and 13Al, by 0.75- to 4.5-MeV protons

Date: November 1, 1991
Creator: Yu, Y. C.; McNeir, M. R.; Weathers, Duncan L.; Duggan, Jerome L.; McDaniel, Floyd Del. (Floyd Delbert), 1942- & Lapicki, Gregory
Description: This article discusses K-shell x-ray-production cross sections. Abstract: K-shell x-ray-production cross sections are reported for elements with K-shell x-ray energies between 277 eV (C) and 1487 eV (Al). The x-ray measurements were made with a windowless Si(Li) detector that was calibrated for efficiency by comparing bremsstrahlung spectra from electron bombardment of thin foils of aluminum, silver, and gold with theoretically determined bremsstrahlung spectral distributions. The x-ray-production cross-section measurements are compared to first-order Born and perturbed-stationary-state with energy-loss, Coulomb deflection, and relativistic corrections (ECPSSR) ionization theories using single-hole fluorescence yields. The ECPSSR and first-order Born theoretical predictions are, in general, in close agreement with each other and both generally fit the data quite well.
Contributing Partner: UNT College of Arts and Sciences
Quantum Irreversibility and Chaos [Phys. Rev. Lett. 67, 2593 (1991)]

Quantum Irreversibility and Chaos [Phys. Rev. Lett. 67, 2593 (1991)]

Date: December 23, 1991
Creator: Bonci, Luca; Roncaglia, Roberto; West, Bruce J. & Grigolini, Paolo
Description: Corrections to an equation printed with a typographical error in Quantum Irreversibility and Chaos, Physical Review Letters 67, 2593 (1991).
Contributing Partner: UNT College of Arts and Sciences
High-Valent Transition-Metal Alkylidene Complexes: Effect of Ligand and Substituent Modification

High-Valent Transition-Metal Alkylidene Complexes: Effect of Ligand and Substituent Modification

Date: 1992
Creator: Cundari, Thomas R., 1964- & Gordon, Mark S.
Description: This article discusses the effects of ligand and substituent modification on the metal-carbon double bond. The main conclusion drawn from this work is that the intrinsic nature of the metal-carbon double bond can typically be changed only within certain limits by modification of the electronegativity of the ligands (L) and substituents (Z).
Contributing Partner: UNT College of Arts and Sciences
Methane Activation by Group IVB Imido Complexes

Methane Activation by Group IVB Imido Complexes

Date: 1992
Creator: Cundari, Thomas R., 1964-
Description: This article discusses a study of methane activation by group IVB imido complexes, when coupled with available experimental data, reveals an interesting picture of this important reaction.
Contributing Partner: UNT College of Arts and Sciences
Spectroscopic Properties of Polycyclic Aromatic Compounds: Examination of Nitromethane as a Selective Fluorescence Quenching Agent for Alternate Polycyclic Aromatic Nitrogen Hetero-Atom Derivatives

Spectroscopic Properties of Polycyclic Aromatic Compounds: Examination of Nitromethane as a Selective Fluorescence Quenching Agent for Alternate Polycyclic Aromatic Nitrogen Hetero-Atom Derivatives

Date: 1992
Creator: Tucker, Sheryl A. (Sheryl Ann); Acree, William E. (William Eugene); Tanga, Mary J.; Tokita, Sumio; Hiruta, Kimihiro & Langhals, Heinz
Description: Article on the spectroscopic properties of polycyclic aromatic compounds and an examination of nitromethane as a selective fluorescence quenching agent for alternant polycyclic aromatic nitrogen hetero-atom derivatives.
Contributing Partner: UNT College of Arts and Sciences
Utilization of Cyanide as a Nitrogenous Substrate by Pseudomonas fluorescens NCIMB 11764: Evidence for Multiple Pathways of Metabolic Conversion

Utilization of Cyanide as a Nitrogenous Substrate by Pseudomonas fluorescens NCIMB 11764: Evidence for Multiple Pathways of Metabolic Conversion

Date: June 1992
Creator: Kunz, Daniel A.; Nagappan, Olagappan; Silva-Avalos, Juan & Delong, George T.
Description: Article on the utilization of cyanide as a nitrogenous substrate by Pseudomonas fluorescens NCIMB 11764 and evidence for multiple pathways of metabolic conversion.
Contributing Partner: UNT College of Arts and Sciences
Semiclassical chaos, the uncertainty principle, and quantum dissipation

Semiclassical chaos, the uncertainty principle, and quantum dissipation

Date: June 15, 1992
Creator: Bonci, Luca; Roncaglia, Roberto; West, Bruce J. & Grigolini, Paolo
Description: Article on semiclassical chaos, the uncertainty principle, and quantum dissipation.
Contributing Partner: UNT College of Arts and Sciences
Direct evidence for the amorphous silicon phase in visible photoluminescent porous silicon

Direct evidence for the amorphous silicon phase in visible photoluminescent porous silicon

Date: August 3, 1992
Creator: Pérez, José M.; Villalobos, J.; McNeill, P.; Prasad, J.; Cheek, R.; Kelber, J. et al.
Description: This article discusses direct evidence for the amorphous silicon phase in visible photoluminescent porous silicon.
Contributing Partner: UNT College of Arts and Sciences
Phonon Softening and High-Pressure Low-Symmetry Phases of Cesium Iodide

Phonon Softening and High-Pressure Low-Symmetry Phases of Cesium Iodide

Date: August 17, 1992
Creator: Buongiorno Nardelli, Marco; Baroni, Stefano & Giannozzi, Paolo
Description: Article on phonon softening and high-pressure low-symmetry phases of cesium iodide.
Contributing Partner: UNT College of Arts and Sciences
Transition Metal Imido Complexes

Transition Metal Imido Complexes

Date: September 1, 1992
Creator: Cundari, Thomas R., 1964-
Description: This articles discusses transition metal imido complexes. A wide range of transition metal imido (TMI) complexes is studied using ab initio molecular orbital (MO) calculations. The main computational point of interest is the further testing of effective core potentials (ECPs) and valence basis sets to allow for the accurate calculation of properties for reasonably sized transition metal complexes.
Contributing Partner: UNT College of Arts and Sciences