Two-phonon scattering in solid neon

Collins, W. M.; Glyde, H. R.

doi:10.1103/physrevb.17.2766

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…To minimize multi-phonon contributions to S(Q, ω), measurements were performed at low momentum transfer. Following arguments given by Collins and Glyde [25], the multiphonon scattering in hcp 3 He at our density should be negligible below about 15 nm −1 . In this Q-regime, S(Q, ω) is dominated by single-phonon scattering.…”

Section: Lineshape and Multi-phonon Contributionssupporting

confidence: 53%

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Study of the lattice dynamics of hexagonal close-packed³He and⁴He using inelastic x-ray scattering

Seyfert

Simmons

Sinn

et al. 1999

J. Phys.: Condens. Matter

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We present the first measurement of the coherent dynamic structure factor S(Q, ω) of solid 3 He. At a density of 13.25(10) cm 3 mol −1 , we observed longitudinal phonons, using high-resolution inelastic x-ray scattering at momentum transfers 6 nm −1 < |Q| < 23 nm −1 . Their dispersion relation was determined along the c-axis in single crystals of hcp 3 He, and the spectra were described with a single-phonon model. For comparison, hcp 4 He at the same density was studied with the same technique. The comparison, including all available 4 He data from neutron scattering experiments, results in a phonon frequency ratio ω 3 /ω 4 of 1.11(5). Special attention is given to the scattering contribution due to multi-phonon excitations.

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Section: Lineshape and Multi-phonon Contributionssupporting

confidence: 53%

“…In this case, analysis of the spectra with the DHO model is not physically meaningful, but can give a description of the unresolved lineshape. Calculations for fcc 4 He [25] reveal the importance of the multi-phonon terms in describing the experimental spectra.…”

Section: Lineshape and Multi-phonon Contributionsmentioning

confidence: 98%