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Herbert Schober 《Monatshefte für Mathematik》1935,42(1):A29
Ohne Zusammenfassung 相似文献
206.
Rols S Cambedouzou J Chorro M Schober H Agafonov V Launois P Davydov V Rakhmanina AV Kataura H Sauvajol JL 《Physical review letters》2008,101(6):065507
The dynamics of confined systems is of major concern for both fundamental physics and applications. In this Letter, the dynamics of C60 fullerene molecules inside single walled carbon nanotubes is studied using inelastic neutron scattering. We identify the C60 vibrations and highlight their sensitivity to temperature. Moreover, a clear signature of rotational diffusion of the C60 is evidenced, which persists at lower temperature than in 3D bulk C60. It is discussed in terms of confinement and of reduced dimensionality of the C60 chain. 相似文献
207.
Paciaroni A Orecchini A Cornicchi E Marconi M Petrillo C Haertlein M Moulin M Schober H Tarek M Sacchetti F 《Physical review letters》2008,101(14):148104
The low-frequency modes of protein hydration water are investigated by inelastic neutron scattering. Experiments on both protonated and fully deuterated maltose binding protein samples allow us to unambiguously single out the contribution from water. The low-energy vibrational density of states of hydration water at 100 K is similar to the density of states of high- and low-density amorphous ice, and quite different from that of simple forms of crystalline ice. This result can be related to the picture of hydration water mass density depending on the protein surface curvature, which supports its glassy behavior. 相似文献
208.
Renker B Bohnen KB Heid R Ernst D Schober H Koza M Adelmann P Schweiss P Wolf T 《Physical review letters》2002,88(6):067001
The phonon spectrum of Mg(1-x)Al(x)B2 shows a strong dependence on the aluminum content x. This is experimentally demonstrated by both Raman and inelastic neutron scattering and theoretically predicted by first-principles calculations. The observed changes in the phonon spectrum are put into perspective with respect to the superconducting properties within this family of materials. 相似文献
209.
Skauli T Vodopyanov KL Pinguet TJ Schober A Levi O Eyres LA Fejer MM Harris JS Gerard B Becouarn L Lallier E Arisholm G 《Optics letters》2002,27(8):628-630
Quasi-phase-matched (QPM) GaAs structures, 0.5 mm thick, 10 mm long, and with 61-mum grating periods, were grown by a combination of molecular-beam epitaxy and hydride vapor phase epitaxy. These were characterized by use of mid-IR second-harmonic generation (SHG) with a ZnGeP(2) (ZGP) optical parametric oscillator as a pump source. The SHG efficiencies of QPM GaAs and QPM LiNbO(3) were directly compared, and a ratio of nonlinear coefficients d(14)(GaAs)/d(33) (LiNbO(3))=5.01+/-0.3 was found at 4.1-mum fundamental wavelength. For input pulse energies as low as 50muJ and approximately 60-ns pulse duration, an internal SHG conversion efficiency of 33% was measured in QPM GaAs. 相似文献
210.
S. Lebedkin B. Renker R. Heid H. Schober H. Rietschel 《Applied Physics A: Materials Science & Processing》1998,66(3):273-280
82 metallofullerenes have been studied at room temperature by Raman (for M=La, Y, Ce, Gd), far-infrared (FIR) (for M=La, Y,
Ce), and inelastic neutron scattering (INS) (for M=La, Y) spectroscopy. Raman and FIR spectra suggest that these metallofullerenes
have a common dominant, if not a single, structure of the C82 cage and a similar bonding of the encapsulated metal ion, i.e. the bonding is primarily electrostatic and the metal atoms
are in the same oxidation state (+3). The metal ion vibrations are located around 160 and 50 cm-1. INS reveals no gap between internal vibrational and external vibrational and rotational modes in the range ∼50–200 cm-1 as is typically observed for other fullerides and also predicted by our model calculations. Presumably this is due to strong
intermolecular interactions between M@C82 units in the bulk sample. The studied metallofullerenes are air sensitive, and degradation in air could be followed by changes
in the Raman spectra.
Received: 24 August 1997/Accepted: 26 September 1997 相似文献