aDepartment of Physics, University of South Africa, P.O. Box 392, Pretoria, 0003, South Africa;bInstitute of Physics, Pedagogical University, Plac Slowianski 6, 65-069, Zielona Góra, Poland
Abstract:
Equations for the temperature dependence of proton and deuteron spin–lattice relaxation rates and second moments due to a complex motion consisting of classical jumps over a potential barrier and quantum mechanical tunneling through the barrier have been derived. Asymmetric double and triple potential wells are considered. These equations have been employed to analyze proton spin–lattice relaxation data for solid naphthazarin in the laboratory and rotating frames as a function of temperature. It is shown that tunneling plays an important role in the proton transfer dynamics of this compound.