Abstract
The authors report proton nuclear magnetic measurements on aluminium trihydride over the temperature range 4.3-300 K. The spectra consist of two resonance lines with different widths. While the broad resonance is specific for AlH3 bulk material, the second one exhibits characteristics typical of molecular hydrogen surface coverage. The line broadening for this line has been observed between 10 K and about 4.6 K and the activation energy of 0.17 kcal mol-1 for the self-diffusion process has been determined. The second and fourth moments for the lowest temperature range are close to those of HCP solid hydrogen (75% ortho-hydrogen concentration). The above data are consistent with an assumption that the second component of the spectra originates from thin (probably monolayer) molecular hydrogen surface coverage.
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