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Spatial delocalization in para-H2 clusters.

Eran Rabani1, Joshua Jortner

  • 1School of Chemistry, The Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel. rabani@tau.ac.il

The Journal of Physical Chemistry. B
|September 22, 2006
PubMed
Summary
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Quantum path integral Monte Carlo simulations reveal dynamic order in para-hydrogen clusters (para-H)N at 2 K. Large clusters exhibit molecular exchange between solvation shells, indicating significant floppiness due to quantum effects.

Area of Science:

  • Quantum chemistry
  • Condensed matter physics
  • Statistical mechanics

Background:

  • Quantum clusters exhibit unique properties due to zero-point energy and quantum fluctuations.
  • Understanding the static and dynamic order in these systems is crucial for their characterization.

Purpose of the Study:

  • To investigate the static and dynamic order in para-hydrogen clusters ((para-H)N, N = 5-33) at 2 K.
  • To explore the influence of quantum effects, including zero-point energy and thermal fluctuations, on cluster structure and dynamics.

Main Methods:

  • Application of the quantum path integral Monte Carlo (PIMC) method.
  • Calculation of the cage correlation function from centroid Monte Carlo trajectories.
  • Analysis of the centroid's dynamic evolution to infer structural changes.

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Main Results:

  • The cage correlation function decays to zero for larger clusters (N = 15-33), indicating molecular exchange between solvation shells.
  • Statistically diminishing back-exchange suggests a directional flow or significant rearrangement.
  • The centroid trajectory analysis reveals substantial changes in solvation shells due to molecular interchange, confirming cluster "floppiness".

Conclusions:

  • Para-hydrogen clusters display significant dynamic behavior driven by quantum effects.
  • The observed molecular exchange highlights the non-rigid and fluid nature of these quantum systems.
  • PIMC simulations provide valuable insights into the structural dynamics of quantum clusters.