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A Novel Method for In Situ Electromechanical Characterization of Nanoscale Specimens
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Published on: June 2, 2017

Electric deflection studies on lead clusters.

Sascha Schäfer1, Sven Heiles, Jörg A Becker

  • 1Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Petersenstrasse 20, 64287 Darmstadt, Germany. sascha@cluster.pc.chemie.tu-darmstadt.de

The Journal of Chemical Physics
|August 7, 2008
PubMed
Summary
This summary is machine-generated.

Lead clusters with specific atom counts (12, 14, 18) exhibit permanent dipole moments, significantly influencing their dielectric response and apparent polarizability. This finding offers insights into the electrical properties of nanoscale lead materials.

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Area of Science:

  • * Physics and Chemistry of Nanomaterials
  • * Atomic and Molecular Physics
  • * Condensed Matter Physics

Background:

  • * Understanding the dielectric response of atomic clusters is crucial for nanoscale material science.
  • * Lead clusters (Pb(N)) are model systems for studying size-dependent properties.

Purpose of the Study:

  • * To investigate the dielectric response of lead clusters (N=7-38) to inhomogeneous electric fields.
  • * To identify cluster sizes with permanent dipole moments and analyze their impact on polarizability.

Main Methods:

  • * Molecular beam experiments were conducted to probe the interaction of lead clusters with electric fields.
  • * Analysis of beam profiles and broadening was used to detect permanent dipole moments and measure polarizability.

Main Results:

  • * Lead clusters with 12, 14, and 18 atoms clearly show permanent dipole moments.
  • * These permanent dipole moments significantly enhance the apparent polarizability of the clusters.
  • * A small broadening in beam profiles for most other cluster sizes indicates permanent dipole moments of (0.01-0.02) D/atom.

Conclusions:

  • * An adiabatic polarization mechanism explains the observed susceptibility anomalies.
  • * Larger lead clusters (N>20) exhibit nearly constant dipole moments per atom, leading to a linear increase in polarizability.
  • * Increased polarizabilities in clusters like Pb(25) may stem from electronic structure or quenched dipole moments.