Strain-broadening of nuclear magnetic resonance lines in copper

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Abstract
The mean-square width of the nuclear magnetic resonance absorption line in copper sheet has been measured with an accuracy of ± 4%, using specimens from a sample of copper (99–98% Cu) on which stored energy measurements had already been made (Clarebrough et al. 1957). Plastic deformation has been found to increase the mean-square line width by up to 40% and there is evidence that the bioadening is proportional to the stored energy. There is also a small reduction in the integrated intensity of the line in deformed specimens, possibly caused by the high strains in regions near the cores of dislocations. The results can be interpreted satisfactorily on a model where both the line width and the stored energy are calculated from the state of strain of the material.