Physics Letters A

Stability of the five-body bi-positronium ion

Alexei M. Frolov, David M. Wardlaw

Published Sep 7, 2008• 5 citations

Publisher

DOI: 10.1016/j.physleta.2008.07.084

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The positronium negative ion, e − e + e − , is one of the simplest three body bound-states. As its constituents have a unique mass ratio, the ion is an attractive candidate for the investigation of the genuine three-body problem. In the present work, laser spectroscopy of this ion has been demonstrated in the UV region. A shape resonance near the positronium ( n =2) formation threshold was clearly observed and the resonance energy was estimated.

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Formation of the Positronium Antihydride Molecules ($$\bar{\textrm{H}}\textrm{Ps}$$) in Low Energy, 5-Body Collisions of Antihydrogen Ion $$\bar{\textrm{H}}^+$$ with Positronium Atoms Ps

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Physics Letters A

Stability of the five-body bi-positronium ion

Alexei M. Frolov, David M. Wardlaw

Published Sep 7, 2008• 5 citations

Publisher

DOI: 10.1016/j.physleta.2008.07.084

Related papers

Review of experimental and theoretical research on positronium ions and molecules

Mohsen Emami-Razavi, Jurij W. Darewych

The European Physical Journal DJun 1, 202121 citations

Collision between two ortho-positronium (Ps) atoms: A four-body Coulomb problem

Hasi Ray

PramanaFeb 17, 20164 citations

Critical Stability of the Negatively Charged Positronium-Like Ions with Yukawa Potentials and Varying Z

Sabyasachi Kar, Yu-Shu Wang, Yang Wang +1 more

The question of stability of a given quantum system made up of charged particles is of fundamental interest in atomic, molecular, and nuclear physics. In this work, the stability for the negatively charged positronium (Ps)-like ions or the three-body system ( Z e + , e − , e − ) with Yukawa potentials is studied using correlated exponential wavefunctions based on the Ritz variational method. We obtained the critical screening parameter μ C as a function of the continuously varied nuclear charge Z , the critical nuclear charge Z C as a function of the screening parameter μ , and the ionization energies in terms of the screening parameter μ and Z . The critical nuclear charge for the bare Coulomb system ( Z e + , e − , e − ) obtained using 700-term correlated exponential wavefunctions is in accord with the reported results. The ionization energy, μ C , and Z C for the Yukawa system ( Z e + , e − , e − ) exhibit interesting behaviors. The present study describes the possible nonexistence of Borromean binding as well as Efimov states. The possible existence of quasi-bound resonances states for the negatively charged screened Ps-like ions is briefly discussed.The question of stability of a given quantum system made up of charged particles is of fundamental interest in atomic, molecular, and nuclear physics. In this work, the stability for the negatively charged positronium (Ps)-like ions or the three-body system ( Z e + , e − , e − ) with Yukawa potentials is studied using correlated exponential wavefunctions based on the Ritz variational method. We obtained the critical screening parameter μ C as a function of the continuously varied nuclear charge Z , the critical nuclear charge Z C as a function of the screening parameter μ , and the ionization energies in terms of the screening parameter μ and Z . The critical nuclear charge for the bare Coulomb system ( Z e + , e − , e − ) obtained using 700-term correlated exponential wavefunctions is in accord with the reported results. The ionization energy, μ C , and Z C for the Yukawa system ( Z e + , e − , e − ) exhibit interesting behaviors. The present study describes the possible nonexistence of Borromean binding as well as Efimov states. The possible existence of quasi-bound resonances states for the negatively charged screened Ps-like ions is briefly discussed.

AtomsJun 3, 20198 citations

Observation of a resonance in the photodetachment of positronium negative ions

Koji Michishio, Susumu Kuma, Tsuneto Kanai +6 more

Journal of Physics Conference SeriesSep 7, 20151 citation

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Hiroyuki Yabu

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Formation of the Positronium Antihydride Molecules ( $\bar{\textrm{H}}\textrm{Ps}$ ) in Low Energy, 5-Body Collisions of Antihydrogen Ion $\bar{\textrm{H}}^+$ with Positronium Atoms PsFormation of the Positronium Antihydride Molecules ($$\bar{\textrm{H}}\textrm{Ps}$$) in Low Energy, 5-Body Collisions of Antihydrogen Ion $$\bar{\textrm{H}}^+$$ with Positronium Atoms Ps

Piotr Froelich, Takuma Yamashita, Yasushi Kino +2 more

Abstract In this paper we present the first pilot calculation of the elastic and inelastic cross sections for the 5-body scattering of antihydrogen ions with positronium atoms. These cross sections have not been calculated before and are not known experimentally. In particular, we focus on the collisional rearrangement reactions $\bar{{ \mathrm H}}^+ + \textrm{Ps} \rightarrow {\bar{\textrm{H}}}\textrm{Ps} +{\mathrm{e^+}}$ H ¯ + + Ps → H ¯ Ps + e + which deplete the $\bar{\textrm{H}}^+$ H ¯ + ions and result in stable atomcules $\bar{\textrm{H}}\textrm{Ps}$ H ¯ Ps . To better understand the mechanism of this rearrangement, we study the 3-dimensional, angle resolved positron densities of the 3- and 4-body fragments in the initial and final states of the rearrangement collision.Abstract In this paper we present the first pilot calculation of the elastic and inelastic cross sections for the 5-body scattering of antihydrogen ions with positronium atoms. These cross sections have not been calculated before and are not known experimentally. In particular, we focus on the collisional rearrangement reactions $$\bar{{ \mathrm H}}^+ + \textrm{Ps} \rightarrow {\bar{\textrm{H}}}\textrm{Ps} +{\mathrm{e^+}}$$ H ¯ + + Ps → H ¯ Ps + e + which deplete the $$\bar{\textrm{H}}^+$$ H ¯ + ions and result in stable atomcules $$\bar{\textrm{H}}\textrm{Ps}$$ H ¯ Ps . To better understand the mechanism of this rearrangement, we study the 3-dimensional, angle resolved positron densities of the 3- and 4-body fragments in the initial and final states of the rearrangement collision.

Few-Body SystemsAug 19, 20240 citations

Formation of the Positronium Antihydride Molecules (

\bar{\textrm{H}}\textrm{Ps}

) in Low Energy, 5-Body Collisions of Antihydrogen Ion

\bar{\textrm{H}}^+

with Positronium Atoms Ps

\bar{{ \mathrm H}}^+ + \textrm{Ps} \rightarrow {\bar{\textrm{H}}}\textrm{Ps} +{\mathrm{e^+}}

H ¯ + + Ps → H ¯ Ps + e + which deplete the

\bar{\textrm{H}}^+

H ¯ + ions and result in stable atomcules

\bar{\textrm{H}}\textrm{Ps}

H ¯ Ps . To better understand the mechanism of this rearrangement, we study the 3-dimensional, angle resolved positron densities of the 3- and 4-body fragments in the initial and final states of the rearrangement collision.