Energy Dependence of Nuclear Recoil Measured with Incoherent Nuclear Scattering of Synchrotron Radiation

Chumakov, A. I.; Rüffer, R.; Grünsteudel, H.; Grübel, G.; Metge, J.; Leupold, O.; Goodwin, Harold A.

doi:10.1209/0295-5075/30/7/009

Cited by 98 publications

(61 citation statements)

References 18 publications

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“…Demonstration experiments using strong radioactive sources that were tuned by large Doppler shifts (Weiss and Langhoff, 1979;Endres et al, 1981) were limited in practice by the notoriously small inelastic absorption cross section and overwhelmingly large background signals. Only recently was the idea of using nuclear resonances to observe phonon excitations revived in synchrotron radiation experi ments Sturhahn et al, 1995;Chumakov et al, 1995), and the extraction of the phonon DOS was demon strated (Sturhahn et al, 1995). The use of pulsed synchrotron radiation and a time-discrimination technique circumvented the background problem, and the new NRIXS method started to produce unique results.…”

Section: Experimental Methodsmentioning

confidence: 99%

Geophysical applications of nuclear resonant spectroscopy

Sturhahn¹,

Jackson²

2007

Advances in High-Pressure Mineralogy

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We summarize recent developments of nuclear resonant spectroscopy methods, such as nuclear resonant inelastic X-ray scattering and synchrotron Mossbauer spec troscopy, and their uses for the geophysical sciences. The inelastic method provides specific vibrational information, for example, the phonon density of states, and, in combination with compression data, it permits the determination of sound velocities and Gruneisen parameters under high pressure and high temperature. The Moss bauer method provides hyperfine interactions between the resonant nucleus and elec tronic environment, such as isomer shifts, quadrupole splittings, and magnetic fields, which provide important information on valence, spin state, and magnetic ordering.Both methods use a nuclear resonant isotope as a probe and can be applied under high pressure and high temperature. The physical mechanism of nuclear resonant scattering and the specifics in applications to Earth materials are presented with ref erence to several high-pressure studies on iron-bearing compounds.

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Section: Experimental Methodsmentioning

confidence: 99%

Geophysical applications of nuclear resonant spectroscopy

Sturhahn¹,

Jackson²

2007

Advances in High-Pressure Mineralogy

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“…The method of NRIXS is selective to the 57 Fe resonant isotope and measures the phonon excitation probability, as described in Refs. [53][54][55][56]. This provides the Fe-partial phonon (vibrational) density of states (VDOS) rather directly with a minimum of modeling [57].…”

Section: Local Environment Of Fe Atomsmentioning

confidence: 99%

Influence of interfaces on the phonon density of states of nanoscale metallic multilayers: Phonon confinement and localization

Keune

Hong

et al. 2018

Phys. Rev. B

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Isotope-selective 57 Fe nuclear resonant inelastic x-ray scattering (NRIXS) measurements and atomic-layer resolved density functional theory (DFT) calculations were used to investigate the effect of interfaces on the vibrational (phonon) density of states (VDOS) of (001)-oriented nanoscale Fe/Ag and Fe/Cr multilayers. The multilayers in the experiment contained isotopically enriched 57 Fe monolayers as probe layers located either at the Fe/Ag or Fe/Cr interfaces or in the center of the Fe films. This allows probing of the vibrational dynamics of Fe sites either at the buried interfaces or in the center of the Fe films. For Fe/Ag multilayers, distinct differences were observed experimentally between the Fe-partial VDOS at the interface and in the center. At the Fe/Ag interface, the high-energy longitudinal-acoustic (LA) phonon peak of Fe near ∼35 meV is suppressed and slightly shifted to lower energy, and the low-energy part of the VDOS below ∼20 meV is drastically enhanced, as compared to the Fe-specific VDOS in the center Fe layers or in bulk Fe. Similar phenomena are found to a less degree in the Fe/Cr multilayers. The measured Fe-partial VDOS was used to determine the Fe site-selective vibrational thermodynamic properties of the multilayers. Our theoretical findings for the layer-dependent VDOS of the multilayers are in qualitative agreement with the experimental results obtained by NRIXS. For Fe/Ag multilayers, which are characterized by a large atomic mass ratio, the experimental and theoretical results demonstrate phonon confinement in the Fe layers and phonon localization at the Fe/Ag interfaces due to the energy mismatch between Ag and Fe LA phonons. These phenomena are reduced or suppressed in the Fe/Cr multilayers with their about equal atomic masses. Moreover, direction-projected Fe VDOS along the (nearly in-plane) incident x-ray beam was computed in order to address the intrinsic vibrational anisotropy of the Fe/Ag multilayer. We have also performed spin-resolved electronic band structure (DFT) calculations, predicting an enhanced magnetic moment (μ Fe = 2.8 μ B ) of the interfacial Fe atoms and a high electron spin polarization (79%) at the Fermi energy for the Fe/Ag interface, as compared to the case of Fe center layers. This is a result of charge transfer from Fe to Ag at the interface. On the contrary, Cr tends to donate electrons to Fe, thus reducing the interfacial Fe moment (μ Fe = 1.9 μ B ). This implies strong chemical bonding at the Fe/Ag and Fe/Cr interfaces, affecting the interfacial VDOS.

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“…Two transitions involving orthogonal Fe motion (ξ = 90°) each contribute a predicted area (3/5) (ϕ α ϕ β ∕ 4 f ) and two transitions involving parallel Fe motion (ξ = 0°) each contribute (9/5) (ϕ α ϕ β ∕ 4 f ), yielding a total area ϕ = 6 5 ( ϕ α ϕ β ∕ f ) (8) intermediate between the areas predicted for in-plane/out-of-plane (Eq. 7) and out-of-plane/ out-of-plane (Eq.…”

Section: Directional Effectsmentioning

confidence: 99%

Vibrational dynamics of biological molecules: Multi-quantum contributions

Leu

Zgierski

Wyllie

et al. 2005

Journal of Physics and Chemistry of Solids

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High-resolution X-ray measurements near a nuclear resonance reveal the complete vibrational spectrum of the probe nucleus. Because of this, nuclear resonance vibrational spectroscopy (NRVS) is a uniquely quantitative probe of the vibrational dynamics of reactive iron sites in proteins and other complex molecules. Our measurements of vibrational fundamentals have revealed both frequencies and amplitudes of 57 Fe vibrations in proteins and model compounds. Information on the direction of Fe motion has also been obtained from measurements on oriented single crystals, and provides an essential test of normal mode predictions. Here, we report the observation of weaker two-quantum vibrational excitations (overtones and combinations) for compounds that mimic the active site of heme proteins. The predicted intensities depend strongly on the direction of Fe motion. We compare the observed features with predictions based on the observed fundamentals, using information on the direction of Fe motion obtained either from DFT predictions or from single crystal measurements. Two-quantum excitations may become a useful tool to identify the directions of the Fe oscillations when single crystals are not available.

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Energy Dependence of Nuclear Recoil Measured with Incoherent Nuclear Scattering of Synchrotron Radiation

Abstract: PACS.76.80 + y -Mossbauer effect; other gamma-ray spectroscopy. PACS.07.85-m -Xand gamma-ray instruments and techniques. PACS. 63.20-e -Phonons and vibrations in crystal lattices.

Cited by 98 publications

References 18 publications

Geophysical applications of nuclear resonant spectroscopy

Geophysical applications of nuclear resonant spectroscopy

Influence of interfaces on the phonon density of states of nanoscale metallic multilayers: Phonon confinement and localization

Vibrational dynamics of biological molecules: Multi-quantum contributions

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