Abstract
We studied the very slow nuclear spin-lattice relaxation of solid as a function of temperature and magnetic field using laser-polarized nuclei. Relaxation times in excess of 500 h were measured. We present evidence for a new relaxation mechanism which results from a Raman spin-phonon scattering process involving the spin-rotation interaction. We also establish the existence of cross relaxation between and the other magnetic isotope and demonstrate that laser-polarized can be used to cross polarize other nuclei that are present in the lattice.
- Received 16 July 1992
DOI:https://doi.org/10.1103/PhysRevLett.70.690
©1993 American Physical Society