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- W1617285460 abstract "Expressions for both the spin-lattice relaxation time in the laboratory frame of reference ${T}_{1}$ and the spin-lattice relaxation time in the rotating frame of reference ${T}_{1X}$ are developed for the intramolecular interaction appropriate for ortho-${mathrm{H}}_{2}$ molecules in the $J=1$ rotational state using a spin-temperature formalism. By assuming the spin system is isotropic in space approximations to the correlation functions are obtained that reduce the theoretical expressions to very simple forms characterized by a single correlation time ${ensuremath{tau}}_{c}$. These expressions are compared to experimental determinations of ${T}_{1}$ and ${T}_{1X}$ made at ${ensuremath{omega}}_{0}=30$ MHz. The measurements were made on $oensuremath{-}{mathrm{H}}_{2}$ concentrations spanning the range 0.2%-10% at the temperatures of 4.2 and 1.0 K. ${T}_{1X}$ is found to be roughly linear in its dependence on $oensuremath{-}{mathrm{H}}_{2}$ concentration whereas ${T}_{1}$ shows an apparent minimum below 1%. Based on a comparison of the theoretical expressions with the data, it is concluded that ${ensuremath{omega}}_{0}{ensuremath{tau}}_{c}ensuremath{ll}1$ for all concentrations studied here and that the ${T}_{1X}$ data are more reliable than the ${T}_{1}$ data. An estimate of the strength of the indirect or Suhl-Nakamura interaction is obtained from the ${T}_{1X}$ data." @default.
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- W1617285460 date "1978-02-01" @default.
- W1617285460 modified "2023-09-26" @default.
- W1617285460 title "Relaxation of ortho-H2molecules in solid para-H2" @default.
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- W1617285460 doi "https://doi.org/10.1103/physrevb.17.1028" @default.
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