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1

The Scattering of Positrons and Positronium by Atoms in the Close-Coupling Approximation

100%

Hewitt R. N., Noble C. J., Bransdfen B. H.

Acta Physica Polonica A

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1995

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vol. 88

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issue 1

139-145

EN

We present some recent results obtained within the close-coupling approximation for both positron and positronium scattering by atoms. We begin by discussing a generalization of the method of Vincent and Phatak to study the formation of Ps- in Ps collisions with H(1s) in a simplified model. The important result of this calculation is that the overall Coulomb interaction which is present in the rearrangement channel is treated exactly. We also present results for positronium formation and ionization for positron scattering by argon atoms. The present calculations are for transitions from the Αr(3s^{2}) subshell and show the importance of the coupling to the continuum.

2

Molecular Structure of Water-Like Positronium Complexes

80%

Rolim F., Mohallem J.

Acta Physica Polonica A

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2005

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vol. 107

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issue 4

661-665

EN

We resort to a previously introduced molecular model for positron complexes to study the molecular structures of Ps_2O and PsOH and to explore their analogies and differences from the molecular structure of water.

3

Is a Molecular Adiabatic Approximation Appropriate to Positronic Atoms and Molecules?

80%

Mohallem J.

Acta Physica Polonica A

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2008

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vol. 113

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issue 5

1465-1469

EN

The adiabatic approximation to positronic atoms and molecules was considered as an option to the computationally unfeasible methods that treat all particles in a common footing, in two different approaches communicated in the 37th PSPA. Here we present further assessment and comparison of the two approaches as a way of evaluating the potential of adiabatic or, as we found preferable, molecular approaches.

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The Scattering of Positrons and Positronium by Atoms in the Close-Coupling Approximation

Molecular Structure of Water-Like Positronium Complexes

Is a Molecular Adiabatic Approximation Appropriate to Positronic Atoms and Molecules?