Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Nuclear forward scattering of synchrotron radiation by deoxymyoglobin (2000)
    Springer
    European biophysics journal 29 (2000), S. 146-152 
    Details
    ISSN: 1432-1017
    Keywords: Key words Myoglobin ; Protein dynamics ; Nuclear forward scattering ; Mössbauer effect ; Synchrotron radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Nuclear forward scattering of synchrotron radiation is used to determine the quadrupole splitting and the mean square displacement of the iron atom in deoxymyoglobin in the temperature range between 50 K and 243 K. Above 200 K an abnormally fast decay of the forward scattered intensity at short times after the synchrotron flash is observed, which is caused by protein-specific motions. The results strongly support the picture that protein dynamics seen at the position of the iron can be understood by harmonic motions in the low temperature regime while in the physiological regime diffusive motions in limited space are present. The shape of the resonance broadening function is investigated. An inhomogeneous broadening with a Lorentzian distribution indicating dipole interactions results in a better agreement with the experimental data than the common Gaussian distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050260
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependent inelastic X-ray scattering of synchrotron radiation on myoglobin analyzed by the Mössbauer effect (1996)
    Springer
    European biophysics journal 25 (1996), S. 43-46 
    Details
    ISSN: 1432-1017
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050015
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Determination of the phonon spectrum of iron in myoglobin using inelastic X-ray scattering of synchrotron radiation (1997)
    Springer
    European biophysics journal 25 (1997), S. 221-224 
    Details
    ISSN: 1432-1017
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050034
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Pure nuclear resonant scattering of synchrotron radiation by a multilayer structure: Theoretical analysis for 169Tm (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 1-11 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The possibility of observing pure nuclear resonant scattering of synchrotron radiation by a multilayer structure containing the 169Tm isotope is analyzed theoretically. The main problem is the need to suppress the enormous background of radiation scattered by electrons. Two methods for the destructive interference of a synchrotron radiation beam in reflection at grazing incidence by a layered system containing Tm nuclei in one of the layers are considered, and their efficiency as applied to the conditions of third-generation synchrotron radiation sources, such as in the European Synchrotron Radiation Facility (ESRF), is calculated. An electron scattering suppression efficiency parameter is formulated as the ratio of the integrated nuclear scattering intensity (with a time delay) to the total prompt electron scattering intensity in assigned ranges of angles and energies. In the first method thin films of a special type on a substrate, viz., GIAR films, are used. In the second method a new effect, which is termed the Bragg antipeak effect and involves the destructive interference of a wave that is Bragg-diffracted in a multilayer superlattice and a wave reflected on the upper boundary of the sample, is employed. The physical properties of the Bragg antipeak effect are considered, and it is found that its efficiency is sufficient for practical use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558623
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Nuclear-resonance beamline at ESRF (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 375-379 
    Details
    ISSN: 0392-6737
    Keywords: Phonons and vibrations in crystal lattices ; Nuclear resonance fluorescence ; Synchrotrons ; Mössbauer effect ; other γ-ray spectroscopy ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The Nuclear-Resonance Beamline at ESRF is dedicated to the excitation of nuclear levels by synchrotron radiation. The source of radiation and optical elements are optimized to provide an intense, highly monochromatic, collimated and stable X-ray beam of small cross-section at the Mössbauer transition energies between 6 keV and 30 keV. The set-up of the beamline allows to perform studies in diffraction, small-angle scattering, forward scattering and incoherent scattering. Equipment is available to maintain the sample at variable temperature and magnetic field. Fast detectors and timing electronics serve to separate the delayed nuclear scattering from the «prompt» electronic scattering and to measure the time spectra of nuclear radiation with sub-nanosecond resolution. The general layout and the parameters of the beamline are reported. Typical domains of applications are discussed and illustrated by first experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458921
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    High-resolution x-ray-diffraction analysis of epitaxially grown yttrium iron garnet films on gadolinium gallium garnet (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 9090-9095 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray-diffraction analysis was applied to determine the lattice strain and degree of crystalline perfection of yttrium iron garnet (YIG) films on [100]- and [111]-oriented gadolinium gallium garnet (GGG) substrates. Rocking curves were measured with a high-resolution x-ray diffractometer in which a four-reflection monochromator in a (+,−,−,+) setting produces a beam with a very small angular divergence (2.3 μrad, Mo Kα1) and energy bandwidth (about 80 meV). Therefore a series of different reflections of intrinsic angular width could be obtained from the same crystalline layer system. The dynamical diffraction theory was used to compute the rocking curves. A simple recursion formula allowed a computer simulation of the measured reflectivity. The fit to the measured rocking curves for each reflection resulted in the probable change of the lattice constant with depth. It was possible to successfully fit the rocking curves of four different reflections of one YIG/GGG crystal with only one strain profile. The changing of the lattice constant gives an insight into the crystal growth and could be important for improving the process. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362643
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    High-energy-resolution x-ray optics with refractive collimators (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 31-33 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have tested the concept of a high-resolution x-ray monochromator with a refractive collimator as an optical element. Two options were examined, where the refractive collimator was included either instead of, or in addition to the first crystal of the high-resolution monochromator. The first approach offers an easy means of improving the energy resolution of conventional optical schemes by few orders of magnitude while still accepting the entire angular divergence of the primary beam. The second approach improves the performance of existing devices with very high-energy resolution and simplifies the design of future optical schemes. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126867
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Quasielastic nuclear forward scattering as a background-free probe of slow glass dynamics in confined geometries (2001)
    Springer
    The European physical journal 22 (2001), S. 301-306 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.43.Fs Glasses – 68.65.-k Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties – 76.80.+y Mössbauer effect; other gamma-ray spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The microscopic dynamics of dibutylphthalate/ferrocene in nanoporous silica matrices with pore sizes of 25, 50, 75, and 200 Å, respectively, has been investigated in a temperature range between 70 and 200 K by nuclear resonant scattering of synchrotron radiation. The decay of the coherently forward scattered signal is enhanced owing to the diffusive motion of resonant nuclei on the timescale of the nuclear resonance lifetime. This enhancement contains information about the self-correlation function for a fixed wave vector k = 7.3 Å-1. In the viscous regime and for 25 Å pores the diffusional dynamics is clearly slowed down when compared to the bulk material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170107
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    The spin-crossover complex [Fe(tpa)(NCS) 2 ] (2001)
    Springer
    The European physical journal 23 (2001), S. 463-472 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 33.25.+k Nuclear resonance and relaxation – 76.80.+y Mössbauer effect; other gamma-ray spectroscopy – 31.15.Ew Density-functional theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The temperature-induced spin crossover of iron(II) in the [ Fe ( tpa )( NCS ) 2 ] complex has been investigated by nuclear forward scattering (NFS), nuclear inelastic scattering (NIS), extended X-ray absorption fine structure (EXAFS) spectroscopy, conventional Mössbauer spectroscopy (MS) and by measurements of the magnetic susceptibility (SQUID). The various measurements consistently show that the transition is complete and abrupt and exhibits a hysteresis between 102 and 110 K. The dependence of the hyperfine parameters of the high-spin (HS) and of the low-spin (LS) phase on temperature is gradual while the effective thickness (determined by the Lamb-Mössbauer factor f LM ) shows a step at the transition temperature. This step could be identified clearly because the effective thickness is measured directly by NFS. The Lamb-Mössbauer factor, the Debye temperature and the mean-square displacement of iron(II) could be determined for the HS and for the LS phase. When comparing the NIS data with the results from density functional theory (DFT), the Fe-N stretching vibrations of both LS and HS phases could be unambiguously identified and the f LM could be factorized for both phases into a lattice and a molecular part. The structural information from EXAFS and DFT geometry optimization are in reasonable agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170038
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Historical overview and introduction (1999)
    Springer
    Hyperfine interactions 123-124 (1999), S. 3-10 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017003419190
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...