Theory of Multiple NMR Spin Echoes of HD Impurities in Solid Para-H2

Abstract

The theory of the formation of NMR multiple echoes for isotopic impurities (HD) in solid para-H2has been developed for the case of weak quantum tunneling of the impurities. The results show that even for low tunneling rates (100–1000 Hz), NMR multiple echoes can be observed for experimentally accessible nuclear spin polarizations and can be used to provide an independent test for the existence of tunneling in the solid hydrogens.