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Multiply charged metal cluster anions.

C Yannouleas1, U Landman, A Herlert

  • 1School of Physics, Georgia Institute of technology, Atlanta 30332-0430, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary
This summary is machine-generated.

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Silver and gold anionic clusters exhibit unique stability patterns and formation sizes. Their decay occurs via electron tunneling, not fission, with theoretical predictions aligning well with experimental findings.

Area of Science:

  • Atomic and Molecular Physics
  • Cluster Science
  • Quantum Chemistry

Background:

  • Understanding the stability and formation of multiply charged atomic clusters is crucial for materials science and chemistry.
  • Previous studies have explored cationic clusters, but anionic cluster behavior, especially for heavier elements like silver and gold, remains less understood.

Purpose of the Study:

  • To investigate the formation and stability patterns of silver dianionic and gold trianionic clusters.
  • To compare experimental observations with theoretical predictions regarding cluster appearance sizes and electronic shell effects.
  • To elucidate the dominant decay mechanism of these multiply anionic clusters.

Main Methods:

  • Utilized advanced Penning-trap experiments to synthesize and study the properties of silver and gold anionic clusters.

Related Experiment Videos

  • Employed a theoretical shell-correction method, incorporating shape deformations, to model cluster behavior.
  • Analyzed decay pathways, distinguishing between electron tunneling and cluster fission.

    • Main Results:

    • Demonstrated remarkable agreement between theoretical predictions and experimental data for cluster appearance sizes and electronic shell effects.
    • Identified electron tunneling through a Coulomb barrier as the predominant decay mechanism for multiply anionic clusters.
    • Observed that the appearance sizes of anionic clusters are independent of those found for multiply cationic clusters.

    Conclusions:

    • The study provides significant insights into the electronic structure and stability of silver and gold anionic clusters.
    • Confirms the validity of the theoretical shell-correction method for predicting properties of multiply charged clusters.
    • Highlights a fundamental difference in decay mechanisms and resulting size distributions between anionic and cationic clusters.