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Diffusion von18O in Eis-Einkristallen

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Physik der kondensierten Materie

Zusammenfassung

Es wurde der Diffusionskoeffizient von18O in Eis-Einkristallen bei verschiedenen Temperaturen zwischen −5°C und −29,5°C gemessen. Die18O-Konzentration wurde aktivierungsanalytisch mittels der Reaktion18O(p, n)18F bestimmt. Es ergab sich nicht nur die gleiche Größenordnung derD-Werte für18O- und3H-Diffusion, sondern auch die gleiche Aktivierungsenergie. Das zeigt, daß die18O- und3H-Diffusion auf der Wanderung ganzer H2O-Moleküle beruht. Ein Leerstellen-Wanderungsmechanismus wird diskutiert.

Résumé

Le coefficient de diffusion de18O dans des monocristaux de glace a été mesuré dans un domaine de température allant de −5°C à −29,5°C. La concentration en18O a été déterminée par la réaction nucléaire18O(p, n)18F. Les résultats montrent que les coefficients de diffusion de18O et3H ainsi que leur énergie d'activation sont du même ordre de grandeur. Cela démontre que la diffusion de18O et3H est due à la migration de molécules entières de H2O. Un mécanisme basé sur la migration des lacunes moléculaires est discuté.

Abstract

The coefficient of18O diffusion in single crystals of ice was measured at various temperatures ranging from −5°C to −29,5°C. The18O concentration was determined by the nuclear reaction18O(p, n)18F caused by recoil protons due to fast neutron irradiation. It was found that the coefficients of18O and3H diffusion are of the same order of magnitude and that they have the same activation energy. This shows that18O and3H diffusion is caused by the migration of whole H2O-molecules. A mechanism of migration over molecular vacancies is discussed.

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Authors and Affiliations

  1. Physik-Department, Technischen Hochschule München, München

    P. Delibaltas, O. Dengel, D. Helmreich, N. Riehl & H. Simon

Authors
  1. P. Delibaltas
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  2. O. Dengel
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  3. D. Helmreich
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  4. N. Riehl
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  5. H. Simon
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Delibaltas, P., Dengel, O., Helmreich, D. et al. Diffusion von18O in Eis-Einkristallen. Phys kondens Materie 5, 166–170 (1966). https://doi.org/10.1007/BF02422709

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  • DOI: https://doi.org/10.1007/BF02422709

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