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- W1969908059 startingPage "1878" @default.
- W1969908059 abstract "We consider the dynamic correlation function $H(stackrel{ensuremath{rightarrow}}{mathrm{k}}, {stackrel{ensuremath{rightarrow}}{mathrm{k}}}^{ensuremath{'}}, ensuremath{omega})$ appearing in the theory of Raman scattering in liquid helium. The simple fact that two atoms cannot overlap each other leads to an excluded-volume condition on the Fourier transform of $H$ with respect to ${stackrel{ensuremath{rightarrow}}{mathrm{k}}}^{ensuremath{'}}$ (or $stackrel{ensuremath{rightarrow}}{mathrm{k}}$) for all $stackrel{ensuremath{rightarrow}}{mathrm{k}}$ (or ${stackrel{ensuremath{rightarrow}}{mathrm{k}}}^{ensuremath{'}}$) and $ensuremath{omega}$. It is demonstrated explicity that none of the available calculations of $H$ satisfy this condition. Hence, none of the existing direct quantitative interpretations of the Raman experiments is reliable. In particular, serious doubt is cast on the conclusiveness of the evidence for a two-roton bound state. Some related matters concerning the light-helium coupling function $t$ are also discussed. It is argued that previous quantitative agreement between theory and experiment is due to compensating errors in $H$ and $t$. An important off-diagonal property of $H$ is also demonstrated." @default.
- W1969908059 created "2016-06-24" @default.
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- W1969908059 date "1975-03-01" @default.
- W1969908059 modified "2023-09-23" @default.
- W1969908059 title "Excluded-volume conditions and Raman scattering in He II" @default.
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- W1969908059 doi "https://doi.org/10.1103/physrevb.11.1878" @default.
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