- Autor(in)
- Referenz
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10 J. Kärger u. E. Renner, Z. phys. Chemie, im Druck.
11 J. R. Zimmerman u. W. E. Brittin, J. phys. Chem. 61, 1328 (1957).
12 D. Michel, u. H. Pfeifer, Z. Naturf. 20a, 220 (1965).
13 A. Abragam, The Principles of Nuclear Magnetism, Oxford 1961.
14 D. Beckert u. H. Pfeifer, Ann. Physik, Leipzig, 16, 262 (1965).
15 H. Pfeifer, Elektronisches Rauschen I, Teubner, Leipzig 1959.
16 J. Crank, The Mathematics of Diffusion, Oxford 1956.
17 E. Renner, Dissertation, Leipzig 1973.
1 H. Pfeifer, Nuclear Magnetic Resonance and Relaxation of Molecules Adsorbed on Solids, in „NMR-Basic Principles and Progress“, Vol. 7, Springer, New York, 1972.
2 K. J. Packer, J. W. Emsley, J. Feeney and L. H. Sutcliffe, Progress in NMR Spectroscopy, Vol. 3, Pergamon Press, London, 1967.
3 H. Y. Resing, Adv. Mol. Relaxation Processes 1 ( 1967 - 68) 109.
4 J. Clifford, B. A. Pethica u. E. G. Smith, in L. Bolis, u. B. A. Pethica: Membrane models and the formation of biological membranes, North-Holland-Publ., Amsterdam, 1969.
5 A. G. Lee, N. J. M. Birdsall, Y. K. Levine u. J. C. Metcalfe, Biochem. Biophys. Acta 255, 43 (1972).
6 R. Göldner, W. Gründer u. H. Schneider, Z. phys. Chemie, im Druck.
7 R. C. Wayne u. R. M. Cotts, Phys. Rev. 151, 264 (1966).
8 J. Kärger, On the measurement of diffusion coefficients by means of nuclear magnetic resonance in the presence of statistically distributed gradients, in: Tagung Hochfrequenzspektroskopie, Leipzig 1969.
9 K. J. Packer, J. Magn. Res. 9, 438 (1973).
D. Michel, Dissertation zur Promotion B, Leipzig 1973.
- Seitenbereich
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0277 - 0286
- Zusammenfsg.
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General equations, describing the nuclear spin relaxation behaviour in heterogeneous systems, consisting of regions with different relaxation times and diffusion coefficients, are presented. For a special two region system, by means of analogue computing technique the influence of both diffusivity and height of the barriers between the regions on total relaxation is studied. It is shown, that using appropriate expressions for the mean lifetimes of the nuclei in the regions, the relaxation function of total magnetisation may be approximated by the formulae of Z<small>IMMERMAN</small> and B<small>RITTIN</small>. These relations may be used for a rough estimation of diffusivity in the systems under consideration.
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- Forschungsartikel