# Positronium atom scattering by H\_2 in a coupled-channel framework

Source: [Positronium atom scattering by H\_2 in a coupled-channel framework](<https://www.sota2.com/research/paper/68fa253b2c2a3760193ae342>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T10:35:47.631Z

Authors: P. K. Biswas, Sadhan K. Adhikari

Published: 2000-12-17T19:20:52.000Z

## Abstract

The scattering of ortho positronium (Ps) by H$\_2$ has been investigated using a three-Ps-state \[Ps(1s,2s,2p)H$\_2($X $^1\\Sigma\_g^+$)\] coupled-channel model and using Born approximation for higher excitations and ionization of Ps and B $^1\\Sigma\_u^+$ and b $^3\\Sigma\_u^+$ excitations of H$\_2$. We employ a recently proposed time-reversal-symmetric nonlocal electron-exchange model potential. We present a calculational scheme for solving the body-frame fixed-nuclei coupled-channel scattering equations for Ps-H$\_2$, which simplifies the numerical solution technique considerably. Ps ionization is found to have the leading contribution to target-elastic and all target-inelastic processes. The total cross sections at low and medium energies are in good agreement with experiment.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/physics/0012039>)

[PDF](<https://arxiv.org/pdf/physics/0012039.pdf>)