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The magnetic nuclear spin diffusion barrier does it: Polarized proton spin clusters are observed by timeresolved polarized neutron scattering from organic radicals of different size

H. B. STUHRMANN1,2,*

Affiliation

  1. Institut de Biologie Structurale Jean-Pierre Ebel, CEA/CNRS/UJF, F-38027 Grenoble cedex 1, France
  2. Helmholtz-Zentrum Geesthacht, D-21494 Geesthacht, Germany

Abstract

Motivated by potentially important applications in structural biology, experiments of time-resolved polarised neutron scattering from dynamic polarised proton spin targets were undertaken in order to elucidate the build-up of proton spin polarisation near paramagnetic centres. Organic radicals of different size like EHBA-CrV, DPPH and a biradical dissolved in a deuterated solvent were used. These experiments show that an intramolecular proton polarization gradient exists, except for EHBA-CrV where it coincides with the radius of its molecular structure. For EHBA-CrV , the deuteration of the solvent was varied. In the absence of deuteration, the radius of the radius of the magnetic spin diffusion barrier then appears to fall slightly below 5 Å, the radius of this molecule. Moreover, the characteristic times for the build-up polarized proton spin domains increase dramatically at lower concentrations of EHBA-CrV..

Keywords

time-resolved polarized neutron scattering, polarized proton spin clusters, organic radicals.

Submitted at: Aug. 17, 2015
Accepted at: Sept. 9, 2015

Citation

H. B. STUHRMANN, The magnetic nuclear spin diffusion barrier does it: Polarized proton spin clusters are observed by timeresolved polarized neutron scattering from organic radicals of different size, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 9-10, pp. 1417-1424 (2015)