Mitigation of loss within a molecular Stark decelerator

Details Mitigation of loss within a molecular Stark decelerator Mitigation of loss within a molecular Stark decelerator

2007-05-23

arxiv.org/abs/0705.3442v1

Eur. Phys. J. D 48, 197 (2008)

Physics

Atomic Physics

13 pages, 17 figures

Scientific paper

10.1140/epjd/e2008-00097-y

The transverse motion inside a Stark decelerator plays a large role in the total efficiency of deceleration. We differentiate between two separate regimes of molecule loss during the slowing process. The first mechanism involves distributed loss due to coupling of transverse and longitudinal motion, while the second is a result of the rapid decrease of the molecular velocity within the final few stages. In this work, we describe these effects and present means for overcoming them. Solutions based on modified switching time sequences with the existing decelerator geometry lead to a large gain of stable molecules in the intermediate velocity regime, but fail to address the loss at very low final velocities. We propose a new decelerator design, the quadrupole-guiding decelerator, which eliminates distributed loss due to transverse/longitudinal couplings throughout the slowing process and also exhibits gain over normal deceleration to the lowest velocities.

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