期刊
EUROPEAN PHYSICAL JOURNAL B
卷 49, 期 2, 页码 157-165出版社
SPRINGER
DOI: 10.1140/epjb/e2006-00037-9
关键词
-
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-Cr-V molecules in glycerol-water mixtures as a function of the concentration of EHBA-Cr-V and for different degrees of deuteration of the solvent. In the EHBA-Cr-V complex, the spins of the 20 protons which surround the paramagnetic Cr-V 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据