Photodetachment of cold OH- in a multipole ion trap

Details Photodetachment of cold OH- in a multipole ion trap Photodetachment of cold OH- in a multipole ion trap

2006-07-27

arxiv.org/abs/physics/0607248v2

Physics

Atomic Physics

Phys. Rev. Lett., in press

Scientific paper

10.1103/PhysRevLett.97.193003

The absolute photodetachment cross section of OH- anions at a rotational and translational temperature of 170K is determined by measuring the detachment-induced decay rate of the anions in a multipole radio-frequency ion trap. In comparison with previous results, the obtained cross section shows the importance of the initial rotational state distribution. Using a tomography scan of the photodetachment laser through the trapped ion cloud, the derived cross section is model-independent and thus features a small systematic uncertainty. The tomography also yields the column density of the OH- anions in the 22-pole ion trap in good agreement with the expected trapping potential of a large field free region bound by steep potential walls.

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