Abstract
Nuclear spin relaxation of methane in solid xenon has been studied by infrared spectroscopy. From the analysis of the temporal changes of the rovibrational peaks, the rates of the nuclear spin relaxation of I = 2 ← 1 correlated to the rotational relaxation of J = 0 ← 1 were obtained at temperatures of 5.1–11.5 K. On the basis of the temperature dependence of the relaxation rate, the activation energy of the indirect two-phonon process was determined to be 50 ± 6 K, which is in good agreement with the rotational transition energies of J = 2 ← 1 and J = 3 ← 1. Taking into account this result and the spin degeneracy, we argue that the lowest J = 3 level in which the I = 1 and I = 2 states are degenerate acts as the intermediate point of the indirect process.
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Sugimoto, T., Arakawa, I. & Yamakawa, K. Nuclear spin relaxation of methane in solid xenon. Eur. Phys. J. D 72, 42 (2018). https://doi.org/10.1140/epjd/e2017-80564-0
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DOI: https://doi.org/10.1140/epjd/e2017-80564-0