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Related Experiment Videos

Second bound state of PsH.

J Mitroy1, M W J Bromley

  • 1Faculty of Technology, Charles Darwin University, Darwin NT 0909, Australia. jxm107@rsphysse.anu.edu.au

Physical Review Letters
|March 16, 2007
PubMed
Summary
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Explicit calculations demonstrate a stable second bound state for PsH (positronium hydride) in specific symmetries. This state is stable against annihilation, with a calculated binding energy against dissociation.

Area of Science:

  • Atomic and Molecular Physics
  • Quantum Chemistry
  • Positron Interactions

Background:

  • Positronium hydride (PsH) is a fundamental few-body system involving an electron, a proton, and a positron.
  • Investigating bound states and annihilation properties of PsH is crucial for understanding positron interactions with matter.
  • Previous studies have explored various states of PsH, but the existence and stability of a second bound state against annihilation require further clarification.

Purpose of the Study:

  • To demonstrate the existence of a second electronically stable bound state of PsH.
  • To determine the stability of this state against positron annihilation (2gamma and 3gamma processes).
  • To calculate the binding energy of this state and compare it with similar systems like NaPs.

Main Methods:

Related Experiment Videos

  • Explicit quantum mechanical calculations were performed.
  • The study focused on {2,4}S;{o} symmetries with a spin-triplet state for the two electrons.
  • Binding energies were calculated with respect to dissociation channels, such as H(2p)+Ps(2p).

Main Results:

  • The existence of a second bound state of PsH was demonstrated.
  • This state is electronically stable and stable against 2gamma and 3gamma positron annihilation.
  • The binding energy against dissociation into H(2p)+Ps(2p) was found to be 7.03 x 10^-4 hartree.
  • The dominant decay mode is predicted to be radiative decay followed by autoionization or annihilation.
  • The NaPs system was also found to be electronically stable with a binding energy of 1.514 x 10^-3 hartree.

Conclusions:

  • A second stable bound state of PsH exists in specific symmetries, offering new insights into positronium chemistry.
  • The calculated stability against annihilation and dissociation provides valuable data for theoretical and experimental studies.
  • The comparison with the NaPs system highlights similarities and differences in the behavior of positron-containing molecules.