Abstract
We describe a linear Paul trap and high-voltage platform specifically designed for the trapping of a large and pure sample of anions from an external keV-energy beam. Capture and confinement in a static configuration of DC potentials was found to occur by transfer of axial to radial ion momentum due to elastic and inelastic collisions. Stability diagrams both in transmission and capture mode were recorded. The trapping efficiency was observed to be very sensitive to the axial potentials relative to the beam energy. Several 104 oxygen anions were loaded from a 2 keV primary beam and confined for several 100 s. Identification of trapped O− ions and contaminants was achieved by selective laser photodetachment.
Highlights
The very small group of atomic and molecular anions that may potentially be cooled using laser radiation has garnered increased attention [1, 2]
We describe a linear Paul trap and high-voltage platform designed for the trapping of a large and pure sample of anions from an external keV-energy beam
Capture and confinement in a static configuration of DC potentials was found to occur by transfer of axial to radial ion momentum due to elastic and inelastic collisions
Summary
The very small group of atomic and molecular anions that may potentially be cooled using laser radiation has garnered increased attention [1, 2]. The successful demonstration of anion laser cooling would pave the way for creating ultracold ensembles of practically any negatively charged particle. A different negative-ion species sharing the same trapping volume with the laser-cooled anions could be sympathetically cooled, reaching temperatures well below that of the trap environment. One prominent application is the preparation of cold (
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