Reference : Time-resolved nuclear spin-dependent small-angle neutron scattering from polarised pr...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Time-resolved nuclear spin-dependent small-angle neutron scattering from polarised proton domains in deuterated solutions
van den Brandt, B. [Paul Scherrer Institute, Switzerland]
Glättli, H. [Commissariat `a l’´Energie Atomique, France]
Grillo, I. [Institut Laue Langevin, France]
Hautle, P. [Paul Scherrer Institute, Switzerland]
Jouve, H. [Institut de Biologie Structurale Jean-Pierre Ebel, France]
Kohlbrecher, J. [Paul Scherrer Institut, Switzerland]
Konter, J. A. [Paul Scherrer Institute, Switzerland]
Leymarie, E. [Commissariat `a l’´Energie Atomique, France]
Mango, S. [Paul Scherrer Institute, Switzerland]
May, R. P. [Institut Laue Langevin, France]
Michels, Andreas mailto [Paul Scherrer Institute, Switzerland]
Stuhrmann, H. B. [Institut de Biologie Structurale Jean-Pierre Ebel, France/GKSS Forschungszentrum, Germany]
Zimmer, O. [Technische Universität München, Germany]
European Physical Journal B -- Condensed Matter
Springer Science & Business Media B.V.
Yes (verified by ORBilu)
New York
[en] We have investigated the process of dynamic proton polarisation by means of time-resolved polarised small-angle neutron scattering (SANS) on frozen solutions of EHBA-CrV molecules in glycerol-water mixtures as a function of the concentration of EHBA-CrV and for different degrees of deuteration of the solvent. In the EHBA-CrV complex, the spins of the 20 protons which surround the paramagnetic CrV can be oriented using the method of dynamic nuclear polarisation (DNP), thereby offering the possibility to create locally a nuclear spin-dependent contrast for SANS. The time constants which describe the build-up of polarisation around the paramagnetic centre and the subsequent diffusion of polarisation in the solvent were determined by analysing the temporal evolution of the nuclear polarisation, which in turn was obtained by fitting a core-shell model to the time-dependent SANS curves. The results on the spin dynamics obtained using the scattering function of a core-shell could be independently confirmed by evaluating the integrated SANS intensity. A thermodynamic one-centre model is presented which is able to reproduce the observed dependence of the proton polarisation times on the proton concentration of the solvent.

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