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1Author    RalphO. SimmonsRequires cookie*
 Title    Single-Particle Momentum Distributions from Deep Inelastic Neutron Scattering (DINS)  
 Abstract    Single-particle longitudinal momentum distributions in condensed matter are now accessible to direct measurement using eV neutrons. Some systems of particular interest include a) quantum solids and fluids, formed from "Hie, 4 He, and H 2 , b) prototype molecular crystals, formed from noble gases, c) fluids such as H 2 and Ne, which show deviations from classical behavior and d) mixed systems, in which guest-host interactions may be important. Quantum solids can be investigated at substan-tially different densities, for different structures, and further, can be compared to the corresponding fluids, with which they have significant similarities in their single-particle properties such as their momentum distributions. Noble gas solids comprise a graduated family with progressively varying importance of zero-point energy, of phonon anharmonicity, and of multi-body forces. They have also been very useful for matrix isolation studies, and eV neutron scattering can yield their center-of-mass motions, not previously seen directly. Finally, noble gas fluids can be used to investigate the nature and extent of final-state effects in the neutron scatttering. Such effects are defined to be the difference between the longitudinal "neutron Compton profile" and the longitudinal momentum distribution. 
  Reference    Z. Naturforsch. 48a, 415—424 (1993); received December 27 1991 
  Published    1993 
  Keywords    Momentum distribution, Dynamics, Neutron scattering 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0415.pdf 
 Identifier    ZNA-1993-48a-0415 
 Volume    48 
2Author    Dieter Rehder, Uwe PuttfarckenRequires cookie*
 Title    Ethyldiphenylphosphin  
 Abstract    und 1.2-Bis [bis(/5-diphenylpho8phinoethyl)pho8phino] ethan: Derivate des Hexacarbonyl]iydridovanadium(-f-1) und Hexacarbonylvanadat(—I) Ethyldiphenylphosphine and l,2-Bis[bis(/?-diphenylphosphinoethyl)phosphino]ethane: Derivatives of Hexacarbonylhydridovanadium(+1) and Hexacarbonylvanadate(—I) The coordination properties of Ph2PEt (pi) and (Ph2PCH2CH2)2PCH2CH2P(CH2CH2PPh2)2 (P2P4) towards HV(CO)6 and [V(CO)6]-are compared. Preparation and spectral properties (IR, X H, 31 P and 51 V NMR) are described for the complexes HV(CO)4(pi)2, [Et4N][V(CO)6-"(pi)N] (n = 1, 2), HY(CO)MP2P4 (m = 1-5) and [Et4N][V(CO) 111P2P4] (M = 1—3). The anionic species are obtained by photo-induced CO exchange, the hydrido complexes by treatment of the anionic complexes with <-BUC1/H20 or -more conveniently -by ion exchange on silica gel (m — 1-3) and sub-sequent UY irradiation (m = 4, 5). Complexes containing four CO groups are cis-con-figurated, the pi species being extremely labile. Trisubstitution yields an isomeric mixture ofmer-and fac-[V(CO)3p2p4] -. A consistent explanation of the X H pattern in the hydride region is possible on the basis of a facecapped octahedral structure with a restricted dynamic behaviour. The positions of the CO ligands in HV(CO)3p2p4 and HV(CO)2P2P4 are facial and trans, respectively. Only chelate five-ring structures are formed. 
  Reference    Z. Naturforsch. 37b, 348—354 (1982); eingegangen am 23. Oktober 1981 
  Published    1982 
  Keywords    Carbonylvanadium, Carbonylvanadiumhydride, Vanadium-NMR, Dynamics 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0348.pdf 
 Identifier    ZNB-1982-37b-0348 
 Volume    37 
3Author    CorneliusG. Kreiter, Michael Kotzian, Ulrich Schubert, Robert Bau, MichaelA. BruckRequires cookie*
 Title    Gehinderte Ligandbewegungen in Übergangsmetallkomplexen, X X II I  
 Abstract    [1] Synthese und dynamisches Verhalten von Dicarbonyl(?7-dien)-bis(trimethyl-phosphan)chrom(O) und Dicarbonyl(iy-dien)-bis(trimethylphosphit)chrom(0) Hindered Ligand Motions in Transition Metal Complexes, X X III [1] Syntheses and Dynamic Behaviour of Dicarbonyl(?7-diene)-bis(trimethylphosphane)-chromium(O) and Dicarbonvl(/;-diene)-bis(trimethylphosphite)chromium(0) C r(C O)2[P(CH3)3]2(/7-diene) (9—14) and C r(C O)2[P(OCH3)3]2(?7-diene) complexes (15—20) were prepared photochemically in high yields from Cr(CO)4[P(CH3)3]2 (1) or C r(C O)4[P(OCH3)3]2 (2), respectively, with the dienes 1,3-butadiene (3), rrans-l,3-pentadiene (4), 2-methyl-l,3-butadiene (5), trans,trans-2,4-hexadiene (6), 2-methyl-l,3-pentadiene (7), and 2-ethyl-l,3-butadiene (8). The stereochemistry of 9—20 was determined by IR and N M R spectroscopy. In the case of dicarbonyl-^-r/ww-l ,3-pentadiene-bis(trimethylphosphane)chromium(0) (10) and the cor­ responding trans,trans-2,4-hexadiene complex 12 the X-ray crystal and molecular structure ana­ lyses confirm the spectroscopic conclusions. The distorted octahedral complexes are obtained exclusively as af-isomers. They show a hindered, degenerate isomerization with an intramolecular mutual exchange of the donor ligands. Trigonal prismatic transition states and distorted octahe­ dral intermediates are appropriate models for the explanation of the degenerate isomerization. The activation barriers for the ligand movement were determined by dynamic 3IP-NMR spectro­ 
  Reference    Z. Naturforsch. 39b, 1553—1564 (1984); eingegangen am 14. Juni 1984 
  Published    1984 
  Keywords    77-Diene Complexes, Syntheses, Stereochemistry, Dynamics 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-1553.pdf 
 Identifier    ZNB-1984-39b-1553 
 Volume    39 
4Author    Peter Babinec, Melánia BabincováRequires cookie*
 Title    Self-Organized Criticality and Dynamic Instability of Microtubule Growth  
 Abstract    We have shown that the distribution of lengths of site nucleated microtubules obey an algebraic power law relationship D (s) = A s~x, where D(s) is relative number of microtubules with length 5, A and i are constants. This relationship indicates the possibility of a self-organized criticality in the dynamic instability of microtubule growth. 
  Reference    Z. Naturforsch. 50c, 739—740 (1995); received May 4/July 2 1995 
  Published    1995 
  Keywords    Microtubule, Dynamics, Instability, Criticality, Self-Organization 
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 TEI-XML for    default:Reihe_C/50/ZNC-1995-50c-0739_n.pdf 
 Identifier    ZNC-1995-50c-0739_n 
 Volume    50 
5Author    G. D. Zissia, C. Bessada3Requires cookie*
 Title    27A1 NMR Spectra of the REC13-A1C13 (RE = Y, La) Glasses and Melts  
 Abstract    27 AI NMR spectra of pure crystalline and molten A1C13 and of RECI3-AICI3 (RE = Y, La) glass form­ ing binary mixtures have been obtained. Compositions corresponding mainly to YC13/A1C13 = 1/3 and LaCiyAlC^ = 1/3.7 have been studied from the glassy and crystalline state up to the melt. The 27A1 spectra can be unambiguously assigned to four-coordinated Al-species, such as A12C16, 'A1C14', and 'A12C17\ The chemical shifts lie between 95 and 110 ppm, very well separated with the -1.6 ppm giv­ en by the 'A1C16' coordination in solid A1C13. From the temperature evolution of the 27Al NMR spec­ tra, a description for the dynamic behaviour of these systems is proposed. 
  Reference    Z. Naturforsch. 56a, 697—701 (2001) 
  Published    2001 
  Keywords    27A1 MAS NMR, REC13-A1C13, Glass Forming Melts, Structure, Dynamics 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0697.pdf 
 Identifier    ZNA-2001-56a-0697 
 Volume    56