Zur Deutung der Protonenspinrelaxation in Glycerin |
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| Authors: | G Preissing F Noack R Kosfeld B Gross |
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| Institution: | 1. Physikalisches Institut der Universit?t Stuttgart, Deutschland
2. Institut für Physikalische Chemie der TH Aachen, Deutschland
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| Abstract: | In contrast with the usual assumption that proton spin relaxation in glycerol originates from rotational molecular diffusion, quantitative evaluation of the temperature and Larmor frequency dependence in the ranges ?30 °C to+70 °C and 10 kHz to 120 MHz, respectively, gives extensive agreement with Fick's translational random walk model. This observation is supported by direct measurements of the self-diffusion constant by means of the pulse gradient method, which reveals the same activation barrier as relaxation spectroscopy. |
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