Taking the rotational relaxation of orthohydrogen (o-H2) in solid hydrogen into account, we have theoretically investigated the longitudinal NMR spin lattice relaxation rate T1-1 of o-H2. The rate T1-1 is characterized by an anomalous maximum, as a function of temperature, at temperatures close to the mean libron energy of o-H2. Application of the theory for o-H2 concentrations between 42% and 75% reveals a nearly concentration-independent mean libron energy equivalent to about 1 K. This qualitatively and quantitatively contradicts the conclusions of other theories, but agrees with recent experiments.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry