Open Access. Powered by Scholars. Published by Universities.^{®}
 Institution
 Keyword

 Photoelectron spectroscopy (2)
 Photoionization (2)
 Auger effect (2)
 Conduction electrons (2)
 Dipoledipoledipole dispersion (1)

 Barium oxides (1)
 BCCD (1)
 Yttrium oxides (1)
 Phase transformations (1)
 HighTC superconductors (1)
 Magnetic flux (1)
 Physical chemistry (1)
 Helium atoms (1)
 Carbon monoxide (1)
 Grain boundaries (1)
 Ab initio (1)
 Copper oxides (1)
 Shear layer (1)
 Pinning (1)
 Cluster level (1)
 Inviscid spatial stability (1)
 Brueckner orbital (1)
 Photoionization of gases (1)
 Chemistry (1)
 Angular distribution (Nuclear physics) (1)
 Number (1)
 Quaternary compounds (1)
 Threebody (1)
 Flame (1)
 Helium (1)
 Publication
 Publication Type
Articles 1  8 of 8
FullText Articles in Physics
Observation Of NonIsotropic Auger Angular Distribution In The C(1s) Shape Resonance Of Co, Oliver Hemmers, Franz Heiser, J. Eiben, R. Wehlitz, U. Becker
Observation Of NonIsotropic Auger Angular Distribution In The C(1s) Shape Resonance Of Co, Oliver Hemmers, Franz Heiser, J. Eiben, R. Wehlitz, U. Becker
Environmental Studies Faculty Publications
Angleresolved highresolution C(KVV) Auger spectra of CO were taken in the vicinity of the C(1s) σ^{*} shape resonance. These spectra show clear evidence for the theoretically predicted anisotropic Kshell Auger emission in molecules. Complementary results from angleresolved photoion spectroscopy show that the small size of the observed effect is, besides the varying intrinsic anisotropy of the Auger decay, also due to a smaller anisotropy in the primary absorption process than originally predicted but in good agreement with more recent calculations. Contrary to this, satellite Auger transitions show unexpectedly large anisotropies.
MultipletChanging Auger Transitions In Valence Double Photoionization, U. Becker, Oliver Hemmers, B. Langer, I. Lee, A. Menzel, R. Wehlitz, M. Ya Amusia
MultipletChanging Auger Transitions In Valence Double Photoionization, U. Becker, Oliver Hemmers, B. Langer, I. Lee, A. Menzel, R. Wehlitz, M. Ya Amusia
Environmental Studies Faculty Publications
The decay of valence satellite states in neon above the first doubleionization threshold has been studied experimentally and theoretically. Special emphasis was given to differentiate between two decay modes: valence Auger and valencemultiplet Auger decay. It is shown that the latter process is predominant in the low kinetic energy part of the spectrum. The main structures of this lowenergy Auger spectrum could be designated by help of calculated transition energies and decay rates.
Tables Of Coincidence Orientations For Ordered Tetragonal L Lo Alloys For A Range Of Axial Ratios, Abha Singh, Alexander H. King
Tables Of Coincidence Orientations For Ordered Tetragonal L Lo Alloys For A Range Of Axial Ratios, Abha Singh, Alexander H. King
Alexander H. King
In this paper we develop and apply techniques for computation of CSL, DSCL and stepvector data for grain boundaries in tetragonal materials for a range of axial ratios. This has application to L10 alloys including TiA1, which is a candidate for lightweight hightemperature structural applications. Our results are compared with others and found to be more accurate and complete. We provide data for a wider range of axial ratios than those considered by previous workers. We have also derived equivalent quaternions for tetragonal crystals in tetragonalcrystal coordinates and listed conditions for selecting a unique reduced rotation in tetragonalcrystal coordinates so ...
HighEnergy Behavior Of The Double Photoionization Of Helium From 2 To 12 Kev, Jon C. Levin, Ivan A. Sellin, B. M. Johnson, Dennis W. Lindle, R. D. Miller, Y. Azuma, H. G. Berry, D.H. Lee, N. Berrah
HighEnergy Behavior Of The Double Photoionization Of Helium From 2 To 12 Kev, Jon C. Levin, Ivan A. Sellin, B. M. Johnson, Dennis W. Lindle, R. D. Miller, Y. Azuma, H. G. Berry, D.H. Lee, N. Berrah
Chemistry and Biochemistry Faculty Publications
We report the ratio of doubletosingle photoionization of He at several photon energies from 2 to 12 keV. By timeofAight methods, we find a ratio consistent with an asymptote at 1.5%±0.2%, essentially reached by h v≈4 keV. Fair agreement is obtained with older shake calculations of Byron and Joachain [Phys. Rev. 164, 1 (1967)], of Aberg [Phys. Rev. A 2, 1726 (1970)], and with recent manybody perturbation theory (MBPT) of Ishihara, Hino, and McGuire [Phys. Rev. A 44, 6980 (1991)]. The result lies below earlier MPBT calculations by Amusia et al. [J. Phys. B 8, 1248 ...
AbsoluteConvective Instabilities And Their Associated Wave Packets In A Compressible Reacting Mixing Layer, F. Q. Hu, T. L. Jackson, D. G. Lasseigne, C. E. Grosch
AbsoluteConvective Instabilities And Their Associated Wave Packets In A Compressible Reacting Mixing Layer, F. Q. Hu, T. L. Jackson, D. G. Lasseigne, C. E. Grosch
Mathematics & Statistics Faculty Publications
In this paper the transition from convective to absolute instability in a reacting compressible mixing layer with finite rate chemistry is examined. The reaction is assumed to be one step, irreversible, and of Arrhenius type. It is shown that absolute instability can exist for moderate heat release without backflow. The effects of the temperature ratio, heat release parameter, Zeldovich number, equivalence ratio, direction of propagation of the disturbances, and the Mach number on the transition value of the velocity ratio are given. The present results are compared to those obtained from the flame sheet model for the temperature using the ...
Pairwise And ManyBody Contributions To Interaction Potentials In He(N) Clusters, Carol A. Parish, Clifford E. Dykstra
Pairwise And ManyBody Contributions To Interaction Potentials In He(N) Clusters, Carol A. Parish, Clifford E. Dykstra
Chemistry Faculty Publications
High level ab initio calculations have been carried out to assess the pairwise additivity of potentials in the attractive or well regions of the potential surfaces of clusters of helium atoms. A large basis set was employed and calculations were done at the Brueckner orbital coupled cluster level. Differences between calculated potentials for several interacting atoms and the corresponding summed pair potentials reveal the three‐body and certain higher order contributions to the interaction strengths. Attraction between rare gas atoms develops from dispersion, and so helium clusters provide the most workable systems for analyzing nonadditivity of dispersion. The results indicate ...
A Geometrical Rationalization Of The Special Properties Of The 14° [001] Grain Boundary In Yba2cu3o7−Δ, Alexander H. King, Abha Singh
A Geometrical Rationalization Of The Special Properties Of The 14° [001] Grain Boundary In Yba2cu3o7−Δ, Alexander H. King, Abha Singh
Alexander H. King
14° [001] tilt grain boundaries in YBa2Cu3O7−δ have been found to exhibit anomalously good superconducting critical currents, associated with magnetic flux pinning, although no special interfacial structure has heretofore been associated with this misorientation. We present an analysis of the geometry of the grain boundary in question and show that it can correspond to a special interface, within the definition of constrained lattice coincidence, which may lead to new understanding of the superconducting behavior of grain boundaries. Our analysis shows that the tetragonal‐to‐orthorhombic phase transformation may have important effects upon grain boundary structure and properties, indicating new ...
Density Functional Studies: First Principles And SemiEmpirical Calculations Of Clusters And Surfaces , Susan Buthaina Sinnott
Density Functional Studies: First Principles And SemiEmpirical Calculations Of Clusters And Surfaces , Susan Buthaina Sinnott
Retrospective Theses and Dissertations
In the research presented here, various theoretical electronic structure techniques are utilized to analyze widely different systems from silicon clusters to transition metal solids and surfaces. For the silicon clusters, first principles density functional methods are used to investigate Si[subscript] N for N = 28. The goal is to understand the different types of bonding that can occur in such small clusters where the coordination of the atoms differs substantially from that of the stable bulk tetrahedral bonding. Such uncoordinated structures can provide a good test of more approximate theories that can be used eventually to model silicon surfaces, of ...