Nuclear Magnetic Resonance, Knight Shift

J. A. Jackson, also of this laboratory, has made room temperature nuclear magnetic resonance studies of the Knight shift of cadmium in slowly cooled CeCd, 45 alloys with different compositions and different histories. All CeCd 4 5 samples tested showed a major peak at almost the same position and shifted from that of metallic cadmium. One sample showed only this peak, while others clearly showed satellite peaks either at larger or at smaller shift. Possibly some samples had small amounts of both satellite peaks, and there was apparently some further difference in the shapes of satellite peaks and of the major peak these latter observations are tenuous, however, since they were near the resolution limit of the apparatus. The differences apparently do not correlate simply with composition however, they may correlate with differences in microphase structures. 

Nuclear magnetic resonance studies are necessary in other metal-ammonia solutions besides sodium to see whether the observed small proton Knight Shift in sodium-ammonia solutions is an universal property of the solutions or not. Also careful Overhauser effect studies of both the metal nucleus as well as the and nuclei are necessary in a number of alkali metal-ammonia solutions in view of Carver and Slichter s measurements on sodium-ammonia solutions. 

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