By Matthias Weidemüller, Claus Zimmermann
Bobbing up from a workshop, this publication surveys the physics of ultracold atoms and molecules considering the newest examine on ultracold phenomena, equivalent to Bose Einstein condensation and quantum computing. numerous reputed authors supply an advent to the sector, masking contemporary experimental effects on atom and molecule cooling in addition to the theoretical treatment.
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Additional info for Interactions in Ultracold Gases: From Atoms to Molecules
46]). (a) 15 Figure 30: Magnetic field contours for the quadrupole trap and the spherical hexapole trap. The current through all the coils is 100 A, the distance between the rings is 2 cm and the contours are plotted 10 G (adapted from Ref. ). The advantage of the loffe trap over the quadrupole configuration is that the field on the axis is non-zero. Since slow atoms will always follow the magnetic field adiabatically, atoms in the center of the quadrupole trap can make a Majorana transition to the non-trapping state if the field in the center is zero.
The most obvious new information in Fig. 12a is that atoms are strongly concentrated at velocities just below that of the resonance condition. This corresponds to the strong peak of slow atoms shown in Fig. 11. 5. 1. Optical Molasses Section 4. presented a discussion of the radiative force on atoms moving in a single laser beam. Here this notion is extended to include the radiative force from more than just one beam. , by retroreflection of a single beam from a mirror), the net force found by adding the radiative forces given in (23) from each of the two beams obviously vanishes for atoms at rest because k is opposite for the two beams.
In the case of a hexapole trap (see Fig. 29b) the gradient in the center of the trap is strongly reduced (see Fig. 30b), which is not very advantageous if evaporative cooling is used. Furthermore, the optical access to the atoms is inhibited by the coil on the axis. Another type of trap is the loffe trap, which is shown in Fig. 29c. The radial confinement is provided by the four bars, whereas the confinement in the axial direction is produced by the two pinch coils. In Fig. 31 the magnetic field contours for this type of trap are shown in two different symmetry planes of the trap.