dorsal/arxiv
View SchemaCalculation of positron binding to silver and gold atoms
| Authors | V. A. Dzuba, V. V. Flambaum, C. Harabati |
|---|---|
| Categories | |
| ArXiv ID | physics/0001058 |
| URL | https://arxiv.org/abs/physics/0001058 |
| DOI | 10.1103/PhysRevA.62.042504 |
Abstract
Positron binding to silver and gold atoms was studied using a fully {\it ab initio} relativistic method, which combines the configuration interaction method with many-body perturbation theory. It was found that the silver atom forms a bound state with a positron with binding energy 123 ($\pm$ 20%) meV, while the gold atom cannot bind a positron. Our calculations reveal the importance of the relativistic effects for positron binding to heavy atoms. The role of these effects was studied by varying the value of the fine structure constant $\alpha$. In the non-relativistic limit, $\alpha = 0$, both systems $e^+$Ag and $e^+$Au are bound with binding energies of about 200 meV for $e^+$Ag and 220 meV for $e^+$Au. Relativistic corrections for a negative ion are essentially different from that for a positron interacting with an atom. Therefore, the calculation of electron affinities cannot serve as a test of the method used for positron binding in the non-relativistic case. However, it is still a good test of the relativistic calculations. Our calculated electron affinities for silver (1.327 eV) and gold (2.307 eV) atoms are in very good agreement with corresponding experimental values (1.303 eV and 2.309 eV respectively).
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"abstract": "Positron binding to silver and gold atoms was studied using a fully {\\it ab\ninitio} relativistic method, which combines the configuration interaction\nmethod with many-body perturbation theory. It was found that the silver atom\nforms a bound state with a positron with binding energy 123 ($\\pm$ 20%) meV,\nwhile the gold atom cannot bind a positron. Our calculations reveal the\nimportance of the relativistic effects for positron binding to heavy atoms. The\nrole of these effects was studied by varying the value of the fine structure\nconstant $\\alpha$. In the non-relativistic limit, $\\alpha = 0$, both systems\n$e^+$Ag and $e^+$Au are bound with binding energies of about 200 meV for\n$e^+$Ag and 220 meV for $e^+$Au. Relativistic corrections for a negative ion\nare essentially different from that for a positron interacting with an atom.\nTherefore, the calculation of electron affinities cannot serve as a test of the\nmethod used for positron binding in the non-relativistic case. However, it is\nstill a good test of the relativistic calculations. Our calculated electron\naffinities for silver (1.327 eV) and gold (2.307 eV) atoms are in very good\nagreement with corresponding experimental values (1.303 eV and 2.309 eV\nrespectively).",
"arxiv_id": "physics/0001058",
"authors": [
"V. A. Dzuba",
"V. V. Flambaum",
"C. Harabati"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.62.042504",
"title": "Calculation of positron binding to silver and gold atoms",
"url": "https://arxiv.org/abs/physics/0001058"
},
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