TITLE

Proton quantum coherence observed in water confined in silica nanopores

AUTHOR(S)
Garbuio, V.; Andreani, C.; Imberti, S.; Pietropaolo, A.; Reiter, G. F.; Senesi, R.; Ricci, M. A.
PUB. DATE
October 2007
SOURCE
Journal of Chemical Physics;10/21/2007, Vol. 127 Issue 15, p154501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Deep inelastic neutron scattering measurements of water confined in nanoporous xerogel powders, with average pore diameters of 24 and 82 Å, have been carried out for pore fillings ranging from 76% to nearly full coverage. DINS measurements provide direct information on the momentum distribution n(p) of protons, probing the local structure of the molecular system. The observed scattering is interpreted within the framework of the impulse approximation and the longitudinal momentum distribution determined using a model independent approach. The results show that the proton momentum distribution is highly non-Gaussian. A bimodal distribution appears in the 24 Å pore, indicating coherent motion of the proton over distances d of approximately 0.3 Å. The proton mean kinetic energy ≤EK>W of the confined water molecule is determined from the second moment of n(p). The ≤EK≥W values, higher than in bulk water, are ascribed to changes of the proton dynamics induced by the interaction between interfacial water and the confining surface.
ACCESSION #
27183151

 

Related Articles

  • Interaction Blockade and Pairing in Two-Dimensional Finite Fermion Systems. Armstrong, J. R.; Rontani, M.; Åberg, S.; Zelevinsky, V. G.; Reimann, S. M. // Few-Body Systems;May2009, Vol. 45 Issue 2-4, p219 

    The properties of two-component fermionic quantum systems in two dimensions, such as they nowadays may be realized with cold atoms in traps, are studied within the pairing model adapted from nuclear physics. We compare the results with those of a full numerical diagonalization of the many-body...

  • Stark broadening of isolated lines: calculation of the diagonal multiplet factor for complex configurations (n1l1n n2l2m n3l3p). Mahmoudi, W. F.; Ben Nessib, N.; Sahal-Bréchot, S. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Jul2008, Vol. 48 Issue 2, p7 

    Owing to the increasing sensitivity of detectors, accurate line profiles are needed for accurate stellar atmospheres modelling and for laboratory and technological plasmas as well. So, Stark broadening parameters of isolated lines of complex atoms and ions within the impact and quasistatic...

  • Anomalous neutron Compton scattering cross sections in ammonium hexachlorometallates. Krzystyniak, M.; Chatzidimitriou-Dreismann, C. A.; Lerch, M.; Lalowicz, Z. T.; Szymocha, A. // Journal of Chemical Physics;3/28/2007, Vol. 126 Issue 12, p124501 

    The authors have performed neutron Compton scattering measurements on ammonium hexachloropalladate (NH4)2PdCl6 and ammonium hexachlorotellurate (NH4)2TeCl6. Both substances belong to the family of ammonium metallates. The aim of the experiment was to investigate the possible role of electronic...

  • Acoustic laser cleaning of silicon surfaces. Geldhauser, T.; Ziese, F.; Merkt, F.; Erbe, A.; Boneberg, J.; Leiderer, P. // Applied Physics A: Materials Science & Processing;Oct2007, Vol. 89 Issue 1, p109 

    We investigate the detachment of small particles from silicon surfaces by means of acoustic waves generated by laser-induced plasma formation at the back side of the sample. It is demonstrated that sufficiently high acoustic intensities can be reached to detach particles in the submicron regime....

  • Unified view on multiconfigurational time propagation for systems consisting of identical particles. Alon, Ofir E.; Streltsov, Alexej I.; Cederbaum, Lorenz S. // Journal of Chemical Physics;10/21/2007, Vol. 127 Issue 15, p154103 

    We show that the successful and formally exact multiconfigurational time-dependent Hartree method (MCTDH) takes on a unified and compact form when specified for systems of identical particles (MCTDHF for fermions MCTDHB for bosons). In particular the equations of motion for the orbitals depend...

  • On the structure of the FeF3 molecule. Hargittai, Magdolna // Journal of Chemical Physics;11/15/2005, Vol. 123 Issue 19, p196101 

    With increasing computational possibilities the question of critical comparison of computed results with experimental data gains importance. Differences in the physical meaning of parameters determined by different techniques and the uncertainties of both experimental and computed parameters...

  • The Generation and Application of Intense Pulsed Ion Beams. Golden, Jeffry; Kapetanakos, Christos A.; Pasour, John A.; Mahaffey, Redge A. // American Scientist;Mar/Apr81, Vol. 69 Issue 2, p173 

    Focuses on the generation and application of intense pulsed ion beams. Fusion schemes that are based on the availability of ultrahigh-power ion beams; Efficiency of iron sources; Electron reflexing devices.

  • Old and New Concepts in Chemical Graph Theory. Pogliani, Lionello // AIP Conference Proceedings;12/26/2007, Vol. 963 Issue 2, p540 

    Molecular connectivity is a branch of chemical graph theory, which, among other things, aims to compute the activities and properties of classes of molecules. Chemical graph theory employs graph concepts to encode the structure of a molecule. The concept of simple graph has been used to...

  • Study of the Xe–NH3 van der Waals complex: High-resolution microwave spectra and ab initio calculations. Qing Wen; Jäger, Wolfgang // Journal of Chemical Physics;5/28/2008, Vol. 128 Issue 20, p204309 

    An ab initio potential energy surface of the Xe–NH3 van der Waals complex was constructed at the coupled cluster level of theory with single, double, and pertubatively included triple excitations. The small-core pseudopotential and augmented correlation-consistent polarized valence...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics