This Extended Linear Ion Trap ("LITE") will be used in conjunction with a Rubidium MOT to study collisions between ions and laser-cooled atoms. The LITE itself is a quadrupole ion trap: the Molybdenum rods are driven at a few hundred Volts of 1 Megacycle Alternating Current with each diagonal pair 180 degrees out of phase with the other pair. The electric field from the rods confines ions in a cloud along the axis of the trap. This cloud can be shuttled between the two regions of the trap by Direct Current bias voltage applied to the rods. The "Interaction Region" is where collisions with cold neutrals will occur. In the "Interrogation Region", the ions are exposed to Ultraviolet Light able to excite an electronic transition, so that there is an absorption signal to assess the state of the ions under interrogation.



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