Raman Scattering from Superfluid Helium

  • Kohji Ohbayashi
Part of the NATO ASI Series book series (NSSB, volume 257)


Various excitations in quantum fluids can be studied by light scattering. Quasielastic light scattering probes excitations of small wave vector such as first and second sounds. By inelastic light scattering, excitations of larger momentums can be studied under the restriction that the total momentum is practically zero. To use inelastic Raman scattering to investigate excitations in quantum fluids was proposed by Halley.1 The first experiment was done by Greytak and Yan.2 Subsequently, Iwamoto3 and Ruvalds and Zawadowski4 proposed the theory of two-roton bound state to explain the experimental spectrum based on the quasiparticle interaction model. Soon after, the prediction was experimentally confirmed by the Greytak’s group.56 The success attracted attention because it yielded accurate estimation of the roton-roton interaction energy which is difficult to obtain by other methods. Although the the concept of the two-roton bound state was criticized,7–9 the model based on quasiparticle interactions was widely accepted for analyses of both neutron and Raman scattering experiments. I refer the readers to the conference proceedings for the works along this line.10


Raman Spectrum Energy Shift Polarization Property Elementary Excitation Break Curve 


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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • Kohji Ohbayashi
    • 1
  1. 1.Faculty of Integrated Arts and SciencesHiroshima UniversityHiroshima 730Japan

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