Generation of a cold pulsed beam of Rb atoms by transfer from a 3D   magneto-optic trap
  We demonstrate a technique for producing a cold pulsed beam of atoms by transferring a cloud of atoms trapped in a three dimensional magneto-optic trap (MOT). The MOT is loaded by heating a getter source of Rb atoms. We show that it is advantageous to transfer with two beams (with a small angle between them) compared to a single beam, because the atoms stop interacting with the beams in the two-beam technique, which results in a Gaussian velocity distribution. The atoms are further cooled in optical molasses by turning off the MOT magnetic field before the transfer beams are turned on. 
Sapam Ranjita Chanu, Ketan D. Rathod, Vasant Natarajan
physics.atom-ph physics.optics