Journal of Low Temperature Physics

, Volume 14, Issue 3–4, pp 317–329 | Cite as

Power series expansion of phonon spectrum in liquid helium

  • Yuh-Ren Lin-Liu
  • Chia-Wei Woo


With the aid of accurate microscopic calculations and rigorous sum rule arguments, available data on the phonon spectrum in liquid helium are analyzed. In particular we present a Tamm-Dancoff calculation of the correction to Feynman's spectrum and show that low-order perturbation calculations are valid. Without making any undue statement about the dispersion formula in the hydrodynamic region, we conclude that at least for 0.3<q<0.7 Å−1 experimental data from inelastic neutron scattering and elastic x-ray scattering are on the whole consistent.


Experimental Data Helium Magnetic Material Power Series Series Expansion 
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Copyright information

© Plenum Publishing Corporation 1974

Authors and Affiliations

  • Yuh-Ren Lin-Liu
    • 1
  • Chia-Wei Woo
    • 1
  1. 1.Department of PhysicsNorthwestern UniversityEvanston

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