The 19 F magnetic resonance absorption of CF 4 and SF 6 in their clathrate hydrates

Author: McDowell C.A.   Raghunathan P.  

Publisher: Taylor & Francis Ltd

ISSN: 1362-3028

Source: Molecular Physics, Vol.13, Iss.4, 1967-01, pp. : 331-441

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Abstract

The second moments of 19 F nuclear magnetic resonance lines of CF 4 and SF 6 in their respective clathrate hydrates indicate that these molecules are but little restricted by the walls of the clathrate cavities, and re-orient freely about chosen axes of symmetry at low temperatures and randomly at high temperatures. Above 150°k, we infer from our results that there occurs a limited isotropic translation, or ‘rattling' movement of an SF 6 guest molecule up to a distance of about 0·5 å from the centre of the clathration volume.