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Elastic and exchanged atom-molecule collisions in 4He-4He-X (X = 40K, 85Rb, 133Cs) systems at low energy
Huan Zhu1,2, Ning-Ning Gao1,2, Hui-Li Han1
1Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, Pepole's Republic of China.
Low-energy collisions in helium-helium-alkali-metal systems show universal behavior. Atom-molecule exchange rates are governed by two-body scattering lengths, simplifying complex three-body interactions.
Area of Science:
- Atomic and Molecular Physics
- Quantum Chemistry
- Low-Energy Collision Dynamics
Background:
- Understanding three-body interactions is crucial for ultracold atomic systems.
- Helium-alkali-metal systems offer a unique platform for studying weakly bound few-body physics.
Purpose of the Study:
- Investigate low-energy collision properties of 4He-4He-X (X = 40K, 85Rb, 133Cs) systems.
- Determine atom-dimer scattering lengths and atom-molecule collisional exchange rates.
- Explore the universality of three-body collision dynamics.
Main Methods:
- Employed the R-matrix propagation method within the hyperspherical coordinate framework.
- Solved the three-body Schrödinger equation using realistic pairwise potentials.
- Derived scattering properties from the calculated potential energy surface.
Main Results:
- Atom-molecule collision exchange rates are primarily governed by the 4HeX two-body scattering lengths.
- Inelastic cross sections exhibit universal behavior when scaled by the two-body scattering length.
- Identified key parameters controlling three-body collision dynamics in these systems.
Conclusions:
- The low-energy collisions in 4He-4He-X systems display universal characteristics.
- Two-body scattering properties significantly influence three-body collision outcomes.
- Findings advance the understanding of weakly bound helium-alkali-metal interactions.
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