Dynamics of atom scattering from 4He nanoclusters

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• 作者：E. Krotscheck and R. E. Zillich
• 关键词：PACS. 36.40. ; c Atomic and molecular clusters ; 67. Quantum fluids and solids ; liquid and solid helium
• 刊名：The European Physical Journal D - Atomic, Molecular and Optical Physics
• 出版年：2007
• 出版时间：July, 2007
• 年：2007
• 卷：43
• 期：1-3
• 页码：113-116
• 全文大小：636 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Atoms, Molecules, Clusters and Plasmas
  Nanotechnology
  Quantum Physics
  Quantum Computing, Information and Physics
  Complexity
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6079

文摘

We present a microscopic theory and results of atom scattering calculations to determine the dispersion of surface modes (ripplons) of superfluid helium-4 nanodroplets, expanding previous work [J. Chem. Phys. 115, 10161 (2001)]. A quantum transport formalism is adapted to the many-body scattering problem, yielding both elastic and inelastic fluxes. We demonstrate that, in analogy to the dynamic structure function S(k,ω) obtained from neutron scattering, a dynamic structure function σ(k,ω) can be obtained from 3He scattering. The 3He dynamic structure function σ(k,ω) is sensitive to surface dynamics, whereas the neutron dynamic structure function S(k,ω) is dominated by bulk-like excitations, in particular by rotons. Unlike for neutron-scattering, the total inelastic cross section for atom-scattering on 4He nanodroplets is large which we believe makes experimental detection feasible. We also show that scattering identical particles, i.e. 4He atoms, does not provide information about the dispersion of surface modes. Instead, inelastically scattered 4He atoms preferably lose roughly half their energy.