Abstract
Both neutron and synchrotron X-ray scattering reveal important features of atomic dynamics and defects in condensed He isotopes. Neutron work has obtained kinetic energies and detailed excitation spectra. Recently, X-ray work has produced accurate Debye-Waller factors of crystal 3He and 4He and has provided the first phonon excitation data on 3He. X-ray diffraction from He isotope crystals also provides the only direct means to measure equilibrium point defect content, and therefore defect free energy. Understanding of all these phenomena is assisted by sophisticated Monte Carlo simulations. Thereby, future experiments on these interesting quantum systems are suggested, and reciprocally, motivations for future theoretical work are provided.
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Simmons, R.O. (2003). Scattering Studies of Condensed Helium Isotopes. In: Ristig, M.L., Gernoth, K.A. (eds) Particle Scattering, X-Ray Diffraction, and Microstructure of Solids and Liquids. Lecture Notes in Physics, vol 610. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45881-6_2
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