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  • Artikel  (260)
  • Springer  (217)
  • Wiley-Blackwell  (21)
  • Springer Nature  (8)
  • American Institute of Physics (AIP)  (6)
  • EDP Sciences  (5)
  • American Society of Hematology  (3)
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  • Artikel  (260)
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  • 1
    Digitale Medien
    Digitale Medien
    Energy dissipation in matrix-isolated silver atoms: A time-resolved fluorescence study (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3434-3440 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The fluorescence from optically excited Ag atoms in Ar, Kr, and Xe matrices has been investigated in a time-resolved synchrotron-radiation study. A detailed energy dissipation model could be established from a systematic analysis of rise and decay times of all the observed fluorescence bands after pulsed excitation into the Ag (4d105p)2P1/2,3/2 levels, and by setting time windows between the excitation pulses in emission and emission-yield spectroscopy. Although the overall wavelength dependence of the decay time follows the λ3 law, the decay time is independent of λ within a given emission band. Finally, the role of energy transfer between Ag atoms and dimers for the evaluation of decay times is briefly addressed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.453892
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  • 2
    Digitale Medien
    Digitale Medien
    Hot electron relaxation dynamics in ZnSe (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1089-1091 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The ultrafast relaxation dynamics of hot electrons, initially photoexcited with an excess energy of 300 meV, are monitored in a high-quality ZnSe epilayer grown on a GaAs substrate by exploiting the intrinsic interferrometric asymmetric Fabry–Perot sample structure. The results are consistent with the expected characteristic electronic LO-phonon emission time of 40–50 fs and provide evidence for the influence of the "hot phonon effect"(or "LO-phonon bottleneck") on the electron cooling dynamics at carrier densities above ∼3×1017 cm−3. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.119736
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  • 3
    Digitale Medien
    Digitale Medien
    The optical spectra of matrix-isolated Znn (n≤6) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1147-1151 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The optical properties of small Zn clusters, especially of Zn2 and Zn3, isolated in neon have been studied over a wide photon energy range by absorption, emission, and photoelectron spectroscopy. By employing emission yield spectroscopy the optical transitions of the dimer and the trimer could be unequivocally distinguished from those of higher clusters in the matrix. For Zn2, the experimental data compare reasonably well with calculations found in the literature. However, the ground state, which is usually calculated to be nonbinding, is found to be bound. The main absorption bands of at least three more Zn clusters, tentatively assigned to Zn4–Zn6, have been derived from the concomitant growth of bands in a systematic concentration study.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.452258
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  • 4
    Digitale Medien
    Digitale Medien
    The optical spectra of matrix-isolated palladium–nitrogen complexes: An investigation by absorption, emission, and photoelectron spectroscopy (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1348-1354 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The optical spectra of palladium in neon and argon matrices containing up to 100% dinitrogen have been studied. Beside the known bands of isolated Pd atoms new strong bands assigned to weakly bonded Pd(N2)m (m=1, 2) complexes appear. The bands are attributed to three different types of transition. The dominant lines are essentially due to transitions localized at the Pd atom but strongly perturbed by a "crystal field'' due to the weakly bonded N2 molecules. Secondly, a vibrational progression at lower energies is assigned to a Pd to N2 charge transfer transition and thirdly, at high energies, a vibrational progression assigned to a locally excited state of an N2 molecule perturbed by weak bonding to Pd is observed. No evidence has been found for the presence of Pd(N2)3. Photoelectron spectra of the Pd(N2)m complexes in neon have been observed. The Pd 4d photoemission peak is shifted with respect to the Pd atom in Ne by ∼1.1 eV to higher binding energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.451222
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  • 5
    Digitale Medien
    Digitale Medien
    The electronic spectra of matrix-isolated nickel atoms: The coexistence of the 3D3 and 3F4 ground states in Ar, Kr, and Xe (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1623-1630 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The electronic spectra of nickel atoms isolated in matrices of the four noble gases have been assigned in considerable detail. The associated experimental and theoretical study has unequivocally revealed that nickel atoms can simultaneously exist in two electronic ground states, 3d94s1:3D3 and 3d84s2:3F4, in argon, krypton, and xenon matrices where they also occupy at least three different trapping sites. In neon they appear to exist in one site and one state, 3d84s2:3F4, only. In argon, krypton, and xenon matrices the 3D3 is the dominant ground state. Some sites occupied by atoms in the 3F4 ground state can be annealed away, but others are found to be stable to this procedure. The effects of the matrix upon the guest atoms are briefly discussed. It is interesting that only one possible case of band splitting can be identified in the spectra though the observed blue shifts are of the usual magnitude.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.448394
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  • 6
    Digitale Medien
    Digitale Medien
    AnO(N) algorithm to automatically generate geometric triangulations satisfying the Delaunay circumsphere criteria (1989)
    Springer
    Engineering with computers 5 (1989), S. 177-193 
    Details
    ISSN: 1435-5663
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Maschinenbau , Technik allgemein
    Notizen: Abstract This paper presents an algorithm for the generation of Delaunay triangulations for general nonmanifold geometric models. Octree concepts are used for point placement and providing the linear, with respect to the number of elements, growth rate of the algorithm. Compatibility and classification procedures are used in conjunction with point injection procedures to ensure that the final Delaunay triangulation is a geometric triangulation of the domain of interest.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02274211
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  • 7
    Digitale Medien
    Digitale Medien
    Evaluation of the undersea habitats - Tektite II, Hydro-Lab, and Edalhab - for scientific saturation diving programs (1973)
    Springer
    Helgoland marine research 24 (1973), S. 16-44 
    Details
    ISSN: 1438-3888
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Summary 1. The assessment of three undersea habitats — Tektite, Hydro-Lab and Edalhab — is based primarily upon the experience of the authors during a total of 62 man-days under saturation diving conditions while conducting biological research programs. 2. A number of desirable and undesirable features were found in each habitat system; none of the individual systems included all of the desirable features. 3. The paper discusses advantages and disadvantages of various features of the habitats including work and living areas, support equipment and techniques, operations and safety. The authors offer their experiences and suggestions to contribute to improvement of habitats and undersea diving operations.
    Notizen: Kurzfassung Eine kritische Bewertung der 3 Unterwasserlaboratorien Tektite II, Hydro-Lab und Edalhab wird auf Grund der praktischen Erfahrungen vorgenommen, die während eines längeren bemannten Einsatzes unter Sättigungsbedingungen im Rahmen eines biologischen Forschungsprogrammes in den USA gewonnen wurden. Keines der erprobten Unterwasser-Systeme erfüllte alle Erwartungen. Alle Habitate wiesen sowohl zufriedenstellende als auch mangelhafte Eigenschaften auf, die ausführlich diskutiert werden. Unter Berücksichtigung der bisher gemachten Erfahrungen werden zahlreiche Anregungen zur Verbesserung von Unterwasserlaboratorien und Empfehlungen für Taucheinsätze mitgeteilt.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01609497
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  • 8
    Digitale Medien
    Digitale Medien
    Die Beziehung zwischen den Minderkomponenten von normalem Gesamthämoglobin erwachsener Menschen, wie sie durch Chromatographie und Stärkeblock-Elektrophorese isoliert wurden (1962)
    Springer
    Colloid & polymer science 183 (1962), S. 86-86 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02260577
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  • 9
    Digitale Medien
    Digitale Medien
    The polarization of the neutrons from the reaction15N(d,n 0)16O atE d=4.35 and 5.50 MeV (1967)
    Springer
    The European physical journal 206 (1967), S. 404-405 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In the reaction15N(d, n 0)16O the angular dependence of the neutron polarization and of the differential cross section was measured at average deuteron energies of 4.35 and 5.50 MeV. Parallel features are observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01326499
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  • 10
    Digitale Medien
    Digitale Medien
    Spectra of neutrons from μ capture in thallium, lead and bismuth (1974)
    Springer
    The European physical journal 268 (1974), S. 57-64 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The energy distributions of neutrons fromμ capture in Tl, Pb, and Bi were measured applying a time-of-flight technique, using de-excitationγ-rays from final nuclei as a time reference. The spectra exhibit an evaporation part, which is described by nuclear temperatures varying fromθ=1.06 MeV for Bi toθ=1.22 MeV for Pb, and an exponentially decreasing high-energy distribution with a relative intensity of ∼10%, which is interpreted, on the basis of a simple model, as being due to direct and pre-compound processes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01670062
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