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Related Experiment Video

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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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Positron binding to lithium excited states.

Dario Bressanini1

  • 1Dipartimento di Scienze ed Alta Tecnologia, Università dell'Insubria, via Lucini 3, 22100 Como, Italy.

Physical Review Letters
|February 2, 2013
PubMed
Summary

Researchers investigated positron binding to excited lithium states. A positron can form a bound state with lithium

Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Positron Interactions

Background:

  • Extensive research exists on positron-atom interactions in ground states.
  • Studies on positron binding to atomic excited states are limited.
  • Lithium was the first atom shown to bind a positron in its ground state.

Purpose of the Study:

  • To investigate the possibility of positron binding to excited states of the lithium atom.
  • To explore positron attachment to specific excited states: 1s(2)2p (2)P(o), 1s2s2p (2)P(o), and 2p(3) (4)S(o).

Main Methods:

  • Theoretical investigation of positron-lithium interactions.
  • Calculation of binding energies for positron attachment to excited lithium states.

Main Results:

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  • The (2)P(o) excited state of lithium does not bind a positron.
  • The (4)S(o) excited state may form a metastable positron-bound state.
  • A stable bound state is formed when a positron attaches to the (4)P(o) excited state of lithium, with a binding energy of approximately 0.003 hartree.

Conclusions:

  • Positron attachment to the (4)P(o) excited state of lithium forms a stable bound state.
  • This bound state can be viewed as an excited state of the positron-lithium system (e(+)Li).
  • The findings could aid in the experimental detection of the theoretically predicted e(+)Li system.