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Observation of giant scattering cross sections in4He

Eric S. Meyer, John C. Mester, M. W. Reynolds +5 more

Physica B Condensed MatterFeb 1, 19943 citations

Scattering lengths and low-energy cross sections for Na-He collisions

Chih-Yuan Lin, Phillip C. Stancil, Heinz–Peter Liebermann +2 more

Bulletin of the American Physical SocietyMay 18, 20060 citations

Ultra-low energy integral scattering cross-sections in helium and the helium dimer binding energy

M. A. Meloni

Aug 1, 20000 citations

Elastic and exchanged atom–molecule collisions in 4He–4He–X (X = 40K, 85Rb, 133Cs) systems at low energy

Huan Zhu, Ningning Gao, Hui-Li Han

We investigate the low-energy collision properties of the 4He-4He-X (X = 40K, 85Rb, 133Cs) systems using the R-matrix propagation method within the hyperspherical coordinate framework. The atom-dimer scattering length and atom-molecule collisional exchange rates are derived by solving the three-body Schrödinger equation using a potential energy surface obtained by summing three realistic pairwise potentials. Our results show that the atom-molecule collision exchange rates in the 4He2 + X → 4HeX + 4He process are primarily governed by the 4HeX two-body scattering lengths. Furthermore, when scaled by this parameter, the inelastic cross sections for all three systems collapse onto a single curve, demonstrating universal behavior. These findings provide new insights into the fundamental properties of weakly bound helium-helium-alkali-metal systems and their role in low-energy three-body collisions.We investigate the low-energy collision properties of the 4He-4He-X (X = 40K, 85Rb, 133Cs) systems using the R-matrix propagation method within the hyperspherical coordinate framework. The atom-dimer scattering length and atom-molecule collisional exchange rates are derived by solving the three-body Schrödinger equation using a potential energy surface obtained by summing three realistic pairwise potentials. Our results show that the atom-molecule collision exchange rates in the 4He2 + X → 4HeX + 4He process are primarily governed by the 4HeX two-body scattering lengths. Furthermore, when scaled by this parameter, the inelastic cross sections for all three systems collapse onto a single curve, demonstrating universal behavior. These findings provide new insights into the fundamental properties of weakly bound helium-helium-alkali-metal systems and their role in low-energy three-body collisions.

The Journal of Chemical PhysicsMay 1, 20250 citations

Low temperature scattering of helium and hydrogen

John C. Mester, Eric Meyer, T. E. Huber +2 more

Physica B Condensed MatterFeb 1, 19943 citations

Spin-exchange scattering cross sections for hydrogen atoms at low temperatures

A. J. Berlinsky, Bernie D. Shizgal

Calculations are presented of the low energy (0 < E ≤ 10−2 eV) spin exchange and frequency shift cross sections for (H,H) scattering, and of their thermal averages for 0 < T < 10 K. In particular, the behaviour of the cross sections in this low energy limit and the role of resonances due to orbiting collisions is studied in detail. A comparison is made with recent nmr measurements on gaseous atomic hydrogen at liquid helium temperatures. The results of this work suggest further useful experiments at low temperatures.Calculations are presented of the low energy (0 < E ≤ 10−2 eV) spin exchange and frequency shift cross sections for (H,H) scattering, and of their thermal averages for 0 < T < 10 K. In particular, the behaviour of the cross sections in this low energy limit and the role of resonances due to orbiting collisions is studied in detail. A comparison is made with recent nmr measurements on gaseous atomic hydrogen at liquid helium temperatures. The results of this work suggest further useful experiments at low temperatures.

Canadian Journal of PhysicsJun 1, 198031 citations

Measurements of giant cross sections in low temperature4He-4He scattering

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