The cross section for light scattering from superfluid helium in which bound roton pairs are created is calculated in a simple model, taking into account both the excitations themselves and their coupling to the light. It is shown that the depolarization ratios from bound and from noninteracting roton pairs are the same, in agreement with experimental values. Since the continuum (scattering) states for the interacting pairs are neglected here, the bound roton pairs give only a δ-function line shape, in contrast to the noninteracting roton pairs.
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Work supported in part by the North Texas State University Faculty Research Fund.
Based in part on a dissertation submitted by S.-T. C. to North Texas State University in partial fulfillment of the Ph.D. degree.
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Kobe, D.H., Cheng, St. Light scattering from bound roton pairs in He II. J Low Temp Phys 19, 379–396 (1975). https://doi.org/10.1007/BF00114089
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DOI: https://doi.org/10.1007/BF00114089