By Kirk W Madison, Kai Bongs, Lincoln D Carr, Ana Maria Rey, Hui Zhai
The purpose of this booklet is to offer evaluation articles describing the newest theoretical and experimental advancements within the box of chilly atoms and molecules. Our desire is this sequence will advertise learn via either highlighting fresh breakthroughs and via outlining probably the most promising examine instructions within the field.
Readership: learn scientists together with graduate scholars and top point undergraduate scholars.
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Additional info for Annual Review of Cold Atoms and Molecules, volume 2
9(e). To increase the density of the cloud, a dimple trap is added to the system. It consists of a 1065-nm laser beam propagating upwards under a small angle of 22◦ to vertical and crossing the laser cooled cloud in the region of transparency. In the plane of the reservoir trap, the dimple beam has a waist of 22 µm. 6 µK, where it has trap oscillation frequencies of 250 Hz in the horizontal plane. Confinement in the vertical direction is only provided by the reservoir trap and results in a vertical trap oscillation frequency of 600 Hz.
Close to 4 × 106 atoms are loaded into a dipole trap, which is formed by the horizontal sheet and a vertical beam of 25 µm 1/e2 -radius in the plane of the horizontal dipole trap. The atomic cloud is not only populating the cross of the dipole trap, but extends ∼1 mm along the horizontal dipole trap. Forced evaporation reduces the trap depth over 550 ms with an exponential time constant of about 250 ms. During evaporation, a large fraction of the atoms in the horizontal beam migrate into the crossing region.
Killian Knowledge of the binding energies in 88 Sr allowed accurate determination of the s-wave scattering lengths for all isotopic collision possibilities. This relied upon a relativistic many-body calculation of the dispersion coefficients for the long-range behavior of the ground-state molecular potential. 16 According to the Wigner threshold law, the elastic cross-section for collisions between neutral particles approaches a constant as the collision energy goes to zero. Most experiments with ultracold atoms reach this limit, and the cross-section is well described by an energy-independent = 0 partial wave for distinguishable particles or indistinguishable bosons.