dorsal/arxiv
View SchemaUltracold collisions of oxygen molecules
| Authors | Alexandr V. Avdeenkov, John L. Bohn |
|---|---|
| Categories | |
| ArXiv ID | physics/0105085 |
| URL | https://arxiv.org/abs/physics/0105085 |
| DOI | 10.1103/PhysRevA.64.052703 |
Abstract
Collision cross sections and rate constants between two ground- state oxygen molecules are investigated theoretically at translational energies below $\sim 1$K and in zero magnetic field. We present calculations for elastic and spin- changing inelastic collision rates for different isotopic combinations of oxygen atoms as a prelude to understanding their collisional stability in ultracold magnetic traps. A numerical analysis has been made in the framework of a rigid- rotor model that accounts fully for the singlet, triplet, and quintet potential energy surfaces in this system. The results offer insights into the effectiveness of evaporative cooling and the properties of molecular Bose- Einstein condensates, as well as estimates of collisional lifetimes in magnetic traps. Specifically, $^{17}O_{2}$ looks like a good candidate for ultracold studies, while $^{16}O_{2}$ is unlikely to survive evaporative cooling. Since $^{17}O_{2}$ is representative of a wide class of molecules that are paramagnetic in their ground state we conclude that many molecules can be successfully magnetically trapped at ultralow temperatures.
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"abstract": "Collision cross sections and rate constants between two ground- state oxygen\nmolecules are investigated theoretically at translational energies below $\\sim\n1$K and in zero magnetic field. We present calculations for elastic and spin-\nchanging inelastic collision rates for different isotopic combinations of\noxygen atoms as a prelude to understanding their collisional stability in\nultracold magnetic traps. A numerical analysis has been made in the framework\nof a rigid- rotor model that accounts fully for the singlet, triplet, and\nquintet potential energy surfaces in this system. The results offer insights\ninto the effectiveness of evaporative cooling and the properties of molecular\nBose- Einstein condensates, as well as estimates of collisional lifetimes in\nmagnetic traps. Specifically, $^{17}O_{2}$ looks like a good candidate for\nultracold studies, while $^{16}O_{2}$ is unlikely to survive evaporative\ncooling. Since $^{17}O_{2}$ is representative of a wide class of molecules that\nare paramagnetic in their ground state we conclude that many molecules can be\nsuccessfully magnetically trapped at ultralow temperatures.",
"arxiv_id": "physics/0105085",
"authors": [
"Alexandr V. Avdeenkov",
"John L. Bohn"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.64.052703",
"title": "Ultracold collisions of oxygen molecules",
"url": "https://arxiv.org/abs/physics/0105085"
},
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