The Experts below are selected from a list of 65046 Experts worldwide ranked by ideXlab platform
Rudolf Rüffer - One of the best experts on this subject based on the ideXlab platform.
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Lattice modes in molecular crystals measured with nuclear Inelastic Scattering
Physical Review B, 2006Co-Authors: V. G. Kohn, Aleksandr I. Chumakov, Rudolf RüfferAbstract:We reveal an important property of nuclear Inelastic Scattering in a molecular crystal with well-separated lattice and molecular modes: The presence of the molecular modes does not change the shape but merely rescales the lattice part of the energy dependence of nuclear Inelastic Scattering. Therefore, the density of states (DOS) of the lattice vibrations can be properly derived even from the lattice part of nuclear Inelastic Scattering alone. In this case, one has to substitute the mean recoil energy of a nucleus by the effective recoil energy of the molecule. In first approximation, the ratio of the recoil energies is close to the ratio of the nuclear and molecular masses. More precisely, it is given by the relative area of the lattice part in the entire DOS. The theoretical analysis is verified with numerical calculations for a model DOS and with the experimental data for the decamethyl ferrocene molecular crystal. More generally, the analysis is valid for any region of nuclear Inelastic Scattering around the central elastic peak with sufficiently narrow lines beyond it. Therefore, the demonstrated property of nuclear Inelastic Scattering allows for a much shorter measuring time in studies of lattice modes in molecular crystals, low-energy molecular modesmore » in proteins, and in investigations of glass dynamics with molecular probes.« less
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Insight to Dynamics of Molecules with Nuclear Inelastic Scattering
Structural Chemistry, 2003Co-Authors: Aleksandr I. Chumakov, Rudolf Rüffer, Olaf Leupold, Ilia SergueevAbstract:We discuss an application of nuclear Inelastic Scattering to molecular dynamics. The basis of the technique, the experimental setup, and the introduction to data treatment are illustrated with examples of hexacyanoferrate (II) and ferrocene. The application of nuclear Inelastic Scattering to more complicated systems is demonstrated by the spin–crossover Fe(II) complex [Fe(bpp)2][BF4]2.
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Nuclear Inelastic Scattering
Hyperfine Interactions, 1998Co-Authors: Aleksandr I. Chumakov, Rudolf RüfferAbstract:The development of the new field of nuclear Inelastic Scattering is reviewed. The experimental technique and the variety of applications are illustrated by recent results obtained at the Nuclear Resonance beamline of the European Synchrotron Radiation Facility.
Aleksandr I. Chumakov - One of the best experts on this subject based on the ideXlab platform.
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Lattice modes in molecular crystals measured with nuclear Inelastic Scattering
Physical Review B, 2006Co-Authors: V. G. Kohn, Aleksandr I. Chumakov, Rudolf RüfferAbstract:We reveal an important property of nuclear Inelastic Scattering in a molecular crystal with well-separated lattice and molecular modes: The presence of the molecular modes does not change the shape but merely rescales the lattice part of the energy dependence of nuclear Inelastic Scattering. Therefore, the density of states (DOS) of the lattice vibrations can be properly derived even from the lattice part of nuclear Inelastic Scattering alone. In this case, one has to substitute the mean recoil energy of a nucleus by the effective recoil energy of the molecule. In first approximation, the ratio of the recoil energies is close to the ratio of the nuclear and molecular masses. More precisely, it is given by the relative area of the lattice part in the entire DOS. The theoretical analysis is verified with numerical calculations for a model DOS and with the experimental data for the decamethyl ferrocene molecular crystal. More generally, the analysis is valid for any region of nuclear Inelastic Scattering around the central elastic peak with sufficiently narrow lines beyond it. Therefore, the demonstrated property of nuclear Inelastic Scattering allows for a much shorter measuring time in studies of lattice modes in molecular crystals, low-energy molecular modesmore » in proteins, and in investigations of glass dynamics with molecular probes.« less
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Insight to Dynamics of Molecules with Nuclear Inelastic Scattering
Structural Chemistry, 2003Co-Authors: Aleksandr I. Chumakov, Rudolf Rüffer, Olaf Leupold, Ilia SergueevAbstract:We discuss an application of nuclear Inelastic Scattering to molecular dynamics. The basis of the technique, the experimental setup, and the introduction to data treatment are illustrated with examples of hexacyanoferrate (II) and ferrocene. The application of nuclear Inelastic Scattering to more complicated systems is demonstrated by the spin–crossover Fe(II) complex [Fe(bpp)2][BF4]2.
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Nuclear Inelastic Scattering
Hyperfine Interactions, 1998Co-Authors: Aleksandr I. Chumakov, Rudolf RüfferAbstract:The development of the new field of nuclear Inelastic Scattering is reviewed. The experimental technique and the variety of applications are illustrated by recent results obtained at the Nuclear Resonance beamline of the European Synchrotron Radiation Facility.
K. Rusek - One of the best experts on this subject based on the ideXlab platform.
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Role of virtual excitation in elastic and Inelastic Scattering
Nuclear Physics A, 2003Co-Authors: N. Keeley, K. W. Kemper, K. RusekAbstract:Abstract The influence of virtual excitation of unbound states in light nuclei on elastic and Inelastic Scattering is investigated. In particular, we elucidate the role of the breakup threshold energy in determining the effect of these excitations on the elastic Scattering by fixing the energy at which the continuum begins. We also show that couplings between these unbound excited states play a major role in the Inelastic Scattering of 7 Li from a 4He target.
Dagmar Gerthsen - One of the best experts on this subject based on the ideXlab platform.
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On the role of Inelastic Scattering in phase-plate transmission electron microscopy.
Ultramicroscopy, 2015Co-Authors: Simon Hettler, Jochen Wagner, Manuel Dries, Marco Oster, Christian M. Wacker, Rasmus R. Schröder, Dagmar GerthsenAbstract:The phase contrast of Au nanoparticles on amorphous-carbon films with different thicknesses is analyzed using an electrostatic Zach phase plate in a Zeiss 912 Ω transmission electron microscope with in-column energy filter. Specifically, unfiltered and plasmon-filtered phase-plate transmission electron microscopy (PP TEM) images are compared to gain insight in the role of coherence after Inelastic Scattering processes. A considerable phase-contrast contribution resulting from a combined elastic-Inelastic Scattering process is found in plasmon-filtered PP TEM images. The contrast reduction compared to unfiltered images mainly originates from zero-order beam broadening caused by the Inelastic Scattering process. The effect of the sequence of the elastic and Inelastic Scattering processes is studied by varying the position of the nanoparticles, which can be either located on top or at the bottom of the amorphous-carbon film with respect to the incident electron beam direction.
D. Muller - One of the best experts on this subject based on the ideXlab platform.
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Semi-exclusive pion production in deep-Inelastic Scattering
Physics Letters B, 1995Co-Authors: A. Brandenburg, Valentin V. Khoze, D. MullerAbstract:Abstract We calculate azimuthal asymmetries and the Callan-Gross R -ratio for semi-exclusive pion production in deep Inelastic Scattering taking into account higher twist effects. Our results are qualitatively different from the QCD-improved parton model predictions for semi-inclusive deep Inelastic Scattering.
