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- W2170621706 abstract "The properties of interference between the one and multiphonon contributions to the dynamic and static scattering functions, S(Q, ω) and S(Q), first considered by Ambegaokar et al., are discussed in detail for b.c.c 3 He and 4 He for comparison with recent neutron and proposed X ray scattering experiments. Calculations of interference for Na and of the Debye temperature appropriate to the Debye–Waller factor in b.c.c 3 He are also presented. In all cases the on shell interference term which alters the one phonon scattering intensity is found to be more important than the off shell term which alters the one phonon line shape. This is characteristic of systems in which anharmonic effects produce a large phonon frequency shift but in which the phonon lifetimes remain long. The difficulty in establishing the one phonon sum rules experimentally in the presence of interference is emphasized. As noted by Horner, existing unusual variations of scattering intensity observed in solid 4 He can be satisfactorily explained by taking account of interference and this difficulty without introducing an anomolous Debye–Waller factor. Comparisons with liquid 4 He suggest a similar difficulty in establishing the sum rules there." @default.
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- W2170621706 date "1974-11-15" @default.
- W2170621706 modified "2023-10-14" @default.
- W2170621706 title "Interference Effects in Neutron and X Ray Scattering" @default.
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- W2170621706 doi "https://doi.org/10.1139/p74-298" @default.
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