Scattering Studies of Condensed Helium Isotopes

  • Ralph O. Simmons
Part of the Lecture Notes in Physics book series (LNP, volume 610)


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.


Molar Volume Maraging Steel Waller Factor Dynamic Structure Factor Vacancy Content 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Ralph O. Simmons
    • 1
  1. 1.Department of Physics and Frederick Seitz Materials Research LaboratoryUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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