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  • 1
    Electronic Resource
    Electronic Resource
    Resonant processes above the carbon 1s ionization threshold in benzene and ethylene (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3004-3009 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Resonant photoemission has been studied above the carbon 1s ionization thresholds in gas-phase benzene and ethylene. The experimental data for both molecules include relative partial cross section and asymmetry-parameter measurements for the C 1s main line and asymmetry-parameter measurements for one C 1s shake-up satellite in each system. Resonances above the C K edge have been analyzed on the basis of their decay to either the C 1s main line or valence-hole states, and have been tentatively assigned as either shape resonances or doubly excited states according to their observed one-electron or many-electron decay, respectively. The importance of determining the resonant behavior of all available photoemission channels in the proximity of a resonance is thus illustrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455902
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  • 2
    Electronic Resource
    Electronic Resource
    Observation of correlation effects in zero kinetic energy electron spectra near the N1s and C1s thresholds in N2, CO, C6H6, and C2H4 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6096-6102 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Zero kinetic energy (ZKE) spectra of N2, CO, C2H4, and C6H6 were taken across the N1s (N2) and C1s ionization thresholds. Discrete resonances at subthreshold photon energies were observed and were found to become more intense as threshold is approached relative to the same peaks in absorption spectra. For N2 the satellite/main line branching ratios at threshold are: 11(1)% for the 419.7(1) eV binding energy satellite, and 2.3(1.0)% for the 426.5(1) eV binding energy satellite. For CO, the branching ratio for the 304.6(1) eV binding energy satellite is 15(2)% at its threshold. Branching ratios at threshold are also determined for the satellites of C6H6 and C2H4. Decay characteristics and assignments of the continuum features of C6H6 and C2H4 are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455425
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  • 3
    Electronic Resource
    Electronic Resource
    MS Xα study of energy levels and optical absorption intensities of the laser crystal Ni^2^+:MgF"2
    Amsterdam : Elsevier
    Chemical Physics Letters 119 (1985), S. 141-143 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(85)80048-8
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  • 4
    Electronic Resource
    Electronic Resource
    Two-photon excitation of proteins
    Amsterdam : Elsevier
    Chemical Physics Letters 104 (1984), S. 109-111 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(84)85315-4
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  • 5
    Electronic Resource
    Electronic Resource
    Goldstone modes of incommensurate chromium alloys : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4824-4826 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spin excitations about the two incommensurate wavevectors of the spin-density-wave (SDW) state in Cr are studied for the first time within the random-phase approximation. Transverse spin-wave (SW) modes and longitudinal phason modes are associated with the rotational and translational symmetries of Cr. While both mode frequencies vanish at the SDW ordering wavevectors, only the SW mode with linear dispersion and mode velocity c=vF/(square root of)3 is undamped for nonzero frequencies. As in a local-moment system, the SW mode corresponds to the rigid rotation of the local magnetic moments. The phason modes have a nearly linear dispersion at low frequencies with velocity cph〈c. As T approaches TN, cph approaches c. Phason modes have been observed in the longitudinally polarized SDW state below 120 K in pure Cr and are responsible for a 60 meV peak in the cross sections midway between the satellites. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361620
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of electron damping and reservoir on the magnetic phase diagram of chromium alloys : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6290-6292 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic phase diagram of chromium alloys sensitively depends on both electron damping and the presence of an electron reservoir. If the damping energy Γ vanishes and the power ρ of the reservoir is infinite, then lightly doped CrMn alloys would experience a first-order transition from an incommensurate (I) to a commensurate (C) spin-density wave (SDW) state with decreasing temperature. Either damping or a finite reservoir may flip the phase boundary from one side of the triple point to the other, allowing a commensurate-to-incommensurate transition with decreasing temperature as observed experimentally. Both damping and a finite reservoir suppress the first-order jumps in the SDW order parameter and wave vector. When ρ≤2, the C-I transition is second order for all temperatures. When ρ(approximately-greater-than)2, the transition is second order near the tricritical point but first order at lower temperatures. Unlike electron damping, an electron reservoir does not shift the paramagnetic phase boundary and triple point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355429
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  • 7
    Electronic Resource
    Electronic Resource
    Longitudinal and transverse Hall resistivity of epitaxial SrRuO3 films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5792-5794 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the longitudinal ρxx and transverse Hall ρxy resistivities of epitaxial SrRuO3 (SRO) under varied applied fields. The Hall resistivity, ρxy, is proportional to 1/(T−Tc) in the paramagnetic state of SRO films, where Tc is the asymptotic Curie temperature. The Lorentz resistivity Δρ(H)Lorentz in a fixed magnetic field in the ferromagnetic regime of SRO films is proportional to A(1−T/Tc)p with p∼0.5. RH is positive for T〉125 K and changes sign at T∼125 K for SRO films. The RH remains negative down to low temperatures. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369921
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  • 8
    Electronic Resource
    Electronic Resource
    Paramagnetic form factors from itinerant electron theory (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3027-3029 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Elastic neutron scattering experiments performed over the past two decades have provided accurate information about the magnetic form factors of paramagnetic transition metals. These measurements have traditionally been analyzed in terms of an atomic-like theory. There are, however, some cases where this procedure does not work, and there remains the overall conceptual problem of using an atomistic theory for systems where the unpaired-spin electrons are itinerant. We have recently developed computer codes for efficiently evaluating the induced magnetic form factors of fcc and bcc itinerant electron paramagnets. Results for the orbital and spin contributions have been obtained for Cr, Nb, V, Mo, Pd, and Rh based on local density bands. By using calculated spin enhancement parameters, we find reasonable agreement between theory and neutron form factor data. In addition, these zero parameter calculations yield predictions for the bulk susceptibility on an absolute scale which are in reasonable agreement with experiment in all treated cases except palladium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335202
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical study of magnetic excitations in Ni3Al (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3697-3699 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Inelastic neutron scattering studies of the transition metal alloy Ni3Al have revealed highly unusual spin-wave behavior, that spin waves have been observed only in a small region around the Brillouin zone center (q(approximately-equal-to)0). Results from calculations of the inelastic neutron scattering cross section based on itinerant electron theory for Ni3Al have led to a relatively simple explanation of this phenomenon. To our knowledge, this is the first calculation of this type for an alloy system. The calculations yield the well-defined Goldstone mode (spin wave) at q=0 but no spin-wave peaks were found for the smallest calculable nonzero momentum transfer, which was just outside the range of q where spin waves were observed experimentally. The reason is simply that the spin wave runs immediately into a region of high density of Stoner excitations (single-particle spin-flip excitations) as q is increased from zero. This system, therefore, represents the extreme limiting case of the itinerant electron theory prediction of spin waves disappearing into the Stoner continuum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338665
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  • 10
    Electronic Resource
    Electronic Resource
    Copper(II) complexes of diaminodiamides in aqueous solution
    Amsterdam : Elsevier
    Polyhedron 3 (1984), S. 559-566 
    Details
    ISSN: 0277-5387
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0277-5387(00)88087-0
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