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 ÎŒm. 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
