@article {MgO2014,
	title = {$^8$Li$^+$ $\beta$-NMR in the Cubic Insulator MgO},
	journal = {J. Phys.: Conf. Ser.},
	volume = {551},
	number = {1},
	year = {2014},
	pages = {012033},
	abstract = {We present extensive high magnetic field β -NMR measurements of 8 Li + implanted in single crystals of MgO. The narrow resonance, consistent with a cubic 8 Li + site, likely the tetrahedral interstitital, is used routinely as a reference for shift measurements. We show the intrinsic linewidth is on the order of 200 Hz, allowing a frequency determination to an accuracy of a few Hz. We find no implantation energy dependence of the resonance within a few ppm, but there is evidence of slow spin dynamics in hole-burning measurements. The spin lattice relaxation is slow. The temperature dependence reveals interesting changes at low temperature whose origin remains uncertain.},
	url = {http://stacks.iop.org/1742-6596/551/i=1/a=012033},
	author = {W A MacFarlane and T J Parolin and D L Cortie and K H Chow and M D Hossain and R F Kiefl and C D P Levy and R M L McFadden and G D Morris and M R Pearson and H Saadaoui and Z Salman and Q Song and D Wang}
}
