Complexes formed in collisions between ultracold alkali-metal diatomic molecules and atoms

被引:20
作者
Frye, Matthew D. [1 ]
Hutson, Jeremy M. [1 ]
机构
[1] Univ Durham, Dept Chem, Joint Quantum Ctr JQC Durham Newcastle, South Rd, Durham DH1 3LE, England
来源
NEW JOURNAL OF PHYSICS | 2021年 / 23卷 / 12期
基金
英国工程与自然科学研究理事会;
关键词
ultracold molecules; sticky collisions; ultracold scattering; Feshbach resonances; POTENTIAL-ENERGY SURFACES; QUANTUM-DEFECT ANALYSIS; UNIFIED THEORY; STATE; PREDISSOCIATION; PHYSICS; MODELS; GAS;
D O I
10.1088/1367-2630/ac3ff8
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We explore the properties of three-atom complexes of alkali-metal diatomic molecules with alkali-metal atoms, which may be formed in ultracold collisions. We estimate the densities of vibrational states at the energy of atom-diatom collisions, and find values ranging from 2.2 to 350 K-1. However, this density does not account for electronic near-degeneracy or electron and nuclear spins. We consider the fine and hyperfine structure expected for such complexes. The Fermi contact interaction between electron and nuclear spins can cause spin exchange between atomic and molecular spins. It can drive inelastic collisions, with resonances of three distinct types, each with a characteristic width and peak height in the inelastic rate coefficient. Some of these resonances are broad enough to overlap and produce a background loss rate that is approximately proportional to the number of outgoing inelastic channels. Spin exchange can increase the density of states from which laser-induced loss may occur.
引用
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页数:16
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