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Proton magnetic resonance in Sr(NH3)6: Evidence for rapid ammonia diffusion

โœ Scribed by T.R. White; W.S. Glaunsinger; D.A. Gordon; R.F. Marzke

Book ID
103018110
Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
509 KB
Volume
53
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The proton magnetic resonance linewidth in Sr@IH& has been measured in the range 40-300 K. Two line-narrowing transitions have been detected aa the temperature is increased. Between 40 and 54 K the linewidth decreases from about 2 to 1.6 G, and in the range 97-140 K the line narrows from about 1.6 G to 15 mG. The results are interpreted in terms of proton tunneling at low temperatures, a transition from tunneling to classical rotation of ammonia molecules between 40 and 54 K, and an ammonia diffusional transition with an activation energy of about 3 kcal/mole in the range 97-i40 K.

๐Ÿ“œ SIMILAR VOLUMES

NMR evidence for two ammonia rotational
NMR evidence for two ammonia rotational hindering potentials in solid Ca(NH3)6
โœ K.B. Rawlings; R.F. Marzke; W.S. Glaunsinger ๐Ÿ“‚ Article ๐Ÿ“… 1983 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 442 KB

Protorr spin -I;txricc rchsarion times in Ca(Ntl~)s h;lve been mcasurrd betwcn 10 xtd 125 I<. Three distinct T, minima hxc brrn ohscrvcd and xc attributed IO NH3 diffusion and to NH3 rotriting in two different hinderin\_r potentink. The resulrs ?;utr~est that there is an apprechblc diffcrcncc in mol