Abstract
We have studied the structural relaxation of quench-condensed films of molecular hydrogen with ultrasonic surface acoustic waves (SAW). Upon annealing, frequency-dependent scattering effects occur indicating a growth of hydrogen crystallites of sizes around 1 μm. The dominant scattering mechanism appears to be a resonant coupling of the SAW to some elastic eigenmodes of the crystallites. During deposition at 1.4 K and subsequent annealing we measured the change of attenuation and sound velocity of the SAW and are able to extract activation energies for the underlying surface diffusion. A strong temperature dependence below 2.5 K of the resonance frequency is reported in the case of H 2- and D 2-crystallites.
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