dorsal/arxiv
View SchemaMetastable neon collisions: anisotropy and scattering length
| Authors | V. P. Mogendorff, E. J. D. Vredenbregt, B. J. Verhaar, H. C. W. Beijerinck |
|---|---|
| Categories | |
| ArXiv ID | physics/0309053 |
| URL | https://arxiv.org/abs/physics/0309053 |
| DOI | 10.1103/PhysRevA.69.012706 |
Abstract
In this paper we investigate the effective scattering length $a$ of spin-polarized Ne*. Due to its anisotropic electrostatic interaction, its scattering length is determined by five interaction potentials instead of one, even in the spin-polarized case, a unique property among the Bose condensed species and candidates. Because the interaction potentials of Ne* are not known accurately enough to predict the value of the scattering length, we investigate the behavior of $a$ as a function of the five phase integrals corresponding to the five interaction potentials. We find that the scattering length has five resonances instead of only one and cannot be described by a simple gas-kinetic approach or the DIS approximation. However, the probability for finding a positive or large value of the scattering length is not enhanced compared to the single potential case. The complex behavior of $a$ is studied by comparing a quantum mechanical five-channel numerical calculation to simpler two-channel models. We find that the induced dipole-dipole interaction is responsible for coupling between the different |\Omega> states, resulting in an inhomogeneous shift of the resonance positions and widths in the quantum mechanical calculation as compared to the DIS approach. The dependence of the resonance positions and widths on the input potentials turns out to be rather straightforward. The existence of two bosonic isotopes of Ne* enables us to choose the isotope with the most favorable scattering length for efficient evaporative cooling towards the Bose-Einstein Condensation transition, greatly enhancing the feasibility to reach this transition.
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"abstract": "In this paper we investigate the effective scattering length $a$ of\nspin-polarized Ne*. Due to its anisotropic electrostatic interaction, its\nscattering length is determined by five interaction potentials instead of one,\neven in the spin-polarized case, a unique property among the Bose condensed\nspecies and candidates. Because the interaction potentials of Ne* are not known\naccurately enough to predict the value of the scattering length, we investigate\nthe behavior of $a$ as a function of the five phase integrals corresponding to\nthe five interaction potentials. We find that the scattering length has five\nresonances instead of only one and cannot be described by a simple gas-kinetic\napproach or the DIS approximation. However, the probability for finding a\npositive or large value of the scattering length is not enhanced compared to\nthe single potential case. The complex behavior of $a$ is studied by comparing\na quantum mechanical five-channel numerical calculation to simpler two-channel\nmodels. We find that the induced dipole-dipole interaction is responsible for\ncoupling between the different |\\Omega\u003e states, resulting in an inhomogeneous\nshift of the resonance positions and widths in the quantum mechanical\ncalculation as compared to the DIS approach. The dependence of the resonance\npositions and widths on the input potentials turns out to be rather\nstraightforward. The existence of two bosonic isotopes of Ne* enables us to\nchoose the isotope with the most favorable scattering length for efficient\nevaporative cooling towards the Bose-Einstein Condensation transition, greatly\nenhancing the feasibility to reach this transition.",
"arxiv_id": "physics/0309053",
"authors": [
"V. P. Mogendorff",
"E. J. D. Vredenbregt",
"B. J. Verhaar",
"H. C. W. Beijerinck"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.69.012706",
"title": "Metastable neon collisions: anisotropy and scattering length",
"url": "https://arxiv.org/abs/physics/0309053"
},
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