# Ultracold homonuclear and heteronuclear collisions in metastable helium

Cocks, Daniel, Whittingham, Ian, and Peach, Gillian (2019) Ultracold homonuclear and heteronuclear collisions in metastable helium. Physical Review A (Atomic, Molecular and Optical Physics), 99 (6). 062712.

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## Abstract

Scattering and ionizing cross sections and rates are calculated for ultracold collisions between metastable helium atoms using a fully quantum-mechanical close-coupled formalism. Homonuclear collisions of the bosonic ${}^{4}$He$^{*} +{}^{4}$He$^{*}$ and fermionic ${}^{3}$He$^{*} + {}^{3}$He$^{*}$ systems, and heteronuclear collisions of the mixed ${}^{3}$He$^{*} +{}^{4}$He$^{*}$ system, are investigated over a temperature range 1~$\mu$K to 1~K. Carefully constructed Born-Oppenheimer molecular potentials are used to describe the electrostatic interaction between the colliding atoms, and complex optical potentials used to represent loss through ionization from the ${}^{1,3}\Sigma$ states. Magnetic spin-dipole mediated transitions from the ${}^{5}\Sigma$ state are included and results reported for spin-polarized and unpolarized systems. Comparisons are made with experimental results, previous semi-classical models, and a perturbed single channel model.

Item ID: 58819 Article (Research - C1) 1094-1622 ultracold atomic collisions, metastable helium, scattering cross sections and rates ©2019 American Physical Society 08 Jul 2019 05:10 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 100% 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 90%97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 10% Total: 2 More Statistics

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