dorsal/arxiv
View SchemaPositronium atom scattering by H_2 in a coupled-channel framework
| Authors | P. K. Biswas, Sadhan K. Adhikari |
|---|---|
| Categories | |
| ArXiv ID | physics/0012039 |
| URL | https://arxiv.org/abs/physics/0012039 |
| DOI | 10.1088/0953-4075/33/8/308 |
| Journal | J. Phys. B, 33 (2000) 1575-1584 |
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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"abstract": "The scattering of ortho positronium (Ps) by H$_2$ has been investigated using\na three-Ps-state [Ps(1s,2s,2p)H$_2($X $^1\\Sigma_g^+$)] coupled-channel model\nand using Born approximation for higher excitations and ionization of Ps and B\n$^1\\Sigma_u^+$ and b $^3\\Sigma_u^+$ excitations of H$_2$. We employ a recently\nproposed time-reversal-symmetric nonlocal electron-exchange model potential. We\npresent a calculational scheme for solving the body-frame fixed-nuclei\ncoupled-channel scattering equations for Ps-H$_2$, which simplifies the\nnumerical solution technique considerably. Ps ionization is found to have the\nleading contribution to target-elastic and all target-inelastic processes. The\ntotal cross sections at low and medium energies are in good agreement with\nexperiment.",
"arxiv_id": "physics/0012039",
"authors": [
"P. K. Biswas",
"Sadhan K. Adhikari"
],
"categories": [
"physics.atm-clus",
"physics.chem-ph"
],
"doi": "10.1088/0953-4075/33/8/308",
"journal_ref": "J. Phys. B, 33 (2000) 1575-1584",
"title": "Positronium atom scattering by H_2 in a coupled-channel framework",
"url": "https://arxiv.org/abs/physics/0012039"
},
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