Elastic low temperature anomalies of solid hydrogen crystallites

Eschenröder, K.; Kiefhaber, H.; Weiß, G.; Claßen, Johannes

doi:10.1007/bf02396730

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…On less well-defined surfaces additional information on hydrogen films, especially concerning their melting behavior down to about 0.15 K, comes from a variety of techniques including surface plasmon resonance, light scattering, photoelectron emission 24 and surface acoustic waves. 25 These experiments reveal that below the bulk triple point (T tp ϭ13.96 K) only films of a few layers are formed. Other approaches involve infrared ͑ir͒ spectroscopy 26 -31 or the scattering of the adsorbate itself from the surface.…”

Section: Introductionmentioning

confidence: 96%

Helium atom scattering studies of the structure and vibrations ofH2physisorbed on MgO(001) single crystals

et al. 2003

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The surface structure and vibrations of normal-H 2 , para-H 2 , HD, and normal-D 2 films physisorbed on in situ cleaved single crystal MgO͑001͒ surfaces, have been investigated at surface temperatures 7-12 K using high-resolution helium atom scattering. The He-diffraction patterns agree with the sequence of c(2ϫ2)c(4ϫ2)-c(6ϫ2) structures previously determined by neutron scattering. For the H 2 monolayer three different adsorbate frequencies, two Einstein modes around 10 meV and a dispersive mode between 2 and 7 meV, are found. HD and D 2 show the expected isotopomer shifts. A second probably ordered H 2 layer is formed upon further adsorption and exhibits one dispersionless mode at 5 meV.

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Section: Introductionmentioning

confidence: 96%

Helium atom scattering studies of the structure and vibrations ofH2physisorbed on MgO(001) single crystals

et al. 2003

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“…12 Recently, surface acoustic waves have been used to study the structural behavior of hydrogen films deposited on a surface of a LiNbO 3 crystal as a response to thermal treatment. [13][14][15] Above a critical temperature, the homogeneous hydrogen film undergoes a transition to a state, where crystallites are formed spontaneously on the surface having their own vibrational resonances. These crystallites are distributed randomly on the surface.…”

Section: Introductionmentioning

confidence: 99%

Interaction of Rayleigh waves with randomly distributed oscillators on the surface

1999

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The attenuation of Rayleigh waves due to their interaction with resonating structures randomly distributed on the surface of a semi-infinite elastic medium is calculated along with the Rayleigh wave frequency. The resonating structures are modeled by single oscillators coupled to the displacement field at the surface of the elastic medium. Using the coherent potential approximation, the dependence of the frequency and damping constant of the Rayleigh waves on wave vectors are determined for various values of the concentration of oscillators on the surface. ͓S0163-1829͑99͒01719-1͔

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