dorsal/arxiv
View SchemaRadiative charge transfer lifetime of the excited state of (NaCa)$^+$
| Authors | Oleg P. Makarov, R. Côté, H. Michels, W. W. Smith |
|---|---|
| Categories | |
| ArXiv ID | physics/0209077 |
| URL | https://arxiv.org/abs/physics/0209077 |
| DOI | 10.1103/PhysRevA.67.042705 |
Abstract
New experiments were proposed recently to investigate the regime of cold atomic and molecular ion-atom collision processes in a special hybrid neutral-atom--ion trap under high vacuum conditions. The collisional cooling of laser pre-cooled Ca$^+$ ions by ultracold Na atoms is being studied. Modeling this process requires knowledge of the radiative lifetime of the excited singlet A$^1\Sigma^+$ state of the (NaCa)$^+$ molecular system. We calculate the rate coefficient for radiative charge transfer using a semiclassical approach. The dipole radial matrix elements between the ground and the excited states, and the potential curves were calculated using Complete Active Space Self-Consistent field and M\"oller-Plesset second order perturbation theory (CASSCF/MP2) with an extended Gaussian basis, 6-311+G(3df). The semiclassical charge transfer rate coefficient was averaged over a thermal Maxwellian distribution. In addition we also present elastic collision cross sections and the spin-exchange cross section. The rate coefficient for charge transfer was found to be $2.3\times 10^{-16}$ cm$^3$/sec, while those for the elastic and spin-exchange cross sections were found to be several orders of magnitude higher ($1.1\times 10^{-8}$ cm$^3$/sec and $2.3\times 10^{-9}$ cm$^3$/sec, respectively). This confirms our assumption that the milli-Kelvin regime of collisional cooling of calcium ions by sodium atoms is favorable with the respect to low loss of calcium ions due to the charge transfer.
{
"annotation_id": "75cf31fa-50ec-47d1-84ba-133d489399ad",
"date_created": "2026-03-02T18:00:39.765000Z",
"date_modified": "2026-03-02T18:00:39.765000Z",
"file_hash": "48a494a0ca6e10c2294b5df6c496236bf17175527b2951db493b609bb0e289ff",
"private": false,
"record": {
"abstract": "New experiments were proposed recently to investigate the regime of cold\natomic and molecular ion-atom collision processes in a special hybrid\nneutral-atom--ion trap under high vacuum conditions. The collisional cooling of\nlaser pre-cooled Ca$^+$ ions by ultracold Na atoms is being studied. Modeling\nthis process requires knowledge of the radiative lifetime of the excited\nsinglet A$^1\\Sigma^+$ state of the (NaCa)$^+$ molecular system. We calculate\nthe rate coefficient for radiative charge transfer using a semiclassical\napproach. The dipole radial matrix elements between the ground and the excited\nstates, and the potential curves were calculated using Complete Active Space\nSelf-Consistent field and M\\\"oller-Plesset second order perturbation theory\n(CASSCF/MP2) with an extended Gaussian basis, 6-311+G(3df). The semiclassical\ncharge transfer rate coefficient was averaged over a thermal Maxwellian\ndistribution. In addition we also present elastic collision cross sections and\nthe spin-exchange cross section. The rate coefficient for charge transfer was\nfound to be $2.3\\times 10^{-16}$ cm$^3$/sec, while those for the elastic and\nspin-exchange cross sections were found to be several orders of magnitude\nhigher ($1.1\\times 10^{-8}$ cm$^3$/sec and $2.3\\times 10^{-9}$ cm$^3$/sec,\nrespectively). This confirms our assumption that the milli-Kelvin regime of\ncollisional cooling of calcium ions by sodium atoms is favorable with the\nrespect to low loss of calcium ions due to the charge transfer.",
"arxiv_id": "physics/0209077",
"authors": [
"Oleg P. Makarov",
"R. C\u00f4t\u00e9",
"H. Michels",
"W. W. Smith"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.67.042705",
"title": "Radiative charge transfer lifetime of the excited state of (NaCa)$^+$",
"url": "https://arxiv.org/abs/physics/0209077"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "eeb62c86-a106-4f9c-a25f-bd5b81a23344",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}